1-Feb-86 09:37:35-MST,30567;000000000001 Return-Path: Received: from BRL-TGR.ARPA by SIMTEL20.ARPA with TCP; Sat 1 Feb 86 09:36:16-MST Received: from usenet by TGR.BRL.ARPA id a002623; 1 Feb 86 9:33 EST From: chris Newsgroups: net.sources Subject: Improved Bcsh (Bourne Shell Cshell-Emulator) Message-ID: <219@globetek.UUCP> Date: 30 Jan 86 17:34:26 GMT To: unix-sources@BRL-TGR.ARPA This is a new, improved version of my Bourne shell cshell-emulator. The code has been cleaned up quite a bit, and a couple of new features added (now supports 'noclobber' and 'iclobber' variables). A bug with 'eval' that caused "illegal I/O" error messages on vanilla V7 shells has also been fixed. I have posted the program in its entirety because a context diff of the old and new versions was longer than the new version... --Chris --------------- cut here --------------------- cut here ------------------- : Bcsh -- A Simple Cshell-Like Command Pre-Processor For The Bourne Shell : : "Copyright (c) Chris Robertson, December 1985" : : This software may be used for any purpose provided the original : copyright notice and this notice are affixed thereto. No warranties of : any kind whatsoever are provided with this software, and it is hereby : understood that the author is not liable for any damagages arising : from the use of this software. : : Features Which the Cshell Does Not Have: : ---------------------------------------- : : + command history persists across bcsh sessions : + global last-command editing via 'g^string1^string2^' syntax : + edit any command via $EDITOR or $VISUAL editors : + history file name, .bcshrc file name, alias file name, and number : of commands saved on termination can be set by environment variables : + prompt may evaluate commands, such as `pwd`, `date`, etc. : + the whole text of interactive 'for' and 'while' loops and 'if' : statements goes into the history list and may be re-run or edited : + multiple copies of commands and requests to see command history : are not added to the history list : + the history mechanism actually stores all commands entered in a : current session, not just $history of them. This means that you : can increase $history on the fly and at once have a larger history. : : : Synonyms: : --------- : : logout, exit, bye write out history file and exit : h, history show current history list : : : Aliases: : -------- : : alias NAME CMND create an alias called NAME to run CMND : unalias NAME remove the alias NAME : : There are no 'current-session only' aliases -- all alias and unalias : commands are permanent, and stored in the $aliasfile. : : If an alias contains positional variables -- $1, $2, $*, etc. -- any : arguments following the alias name are considered to be values for : those variables, and the alias is turned into a command of the form : 'set - arguments;alias'. Otherwise, a simple substitution is performed : for the alias and the rest of the command preserved. The cshell : convention of using '\!:n' in an alias to get bits of the current : command is mercifully abandoned. : : Quotes are not necessary around the commands comprising an alias; : in fact, any enclosing quotes are stripped when the alias is added : to the file. : : A couple of typical aliases might be: : : goto cd $1;pwd : l ls -F : : Note that aliasing something to "commands;logout" will not work -- if : you want something to happen routinely on logout put it in the file : specified by $logoutfile, default = $HOME/.blogout. : : : Command Substitutions: : ---------------------- : : !! substitute last command from history list : !!:N substitute Nth element of last command from : history list -- 0 = command name, 1 = 1st arg : !!:$ substitute last element of last command from : history list : !!:* substitute all arguments to last command : from history list : !NUMBER substitute command NUMBER from the history list : !NUMBER:N as above, but substitute Nth element, where : 0 = command name, 1 = 1st arg, etc. : !NUMBER:$ as above, but substitute last element : !NUMBER:* as above, but substitute all arguments : !-NUMBER substitute the command NUMBER lines from the : end of the history list; 1 = last command : !-NUMBER:N as above, but substitute Nth element, where : 0 = command name, 1 = 1st arg, etc. : !-NUMBER:$ as above, but substitute last element : !-NUMBER:* as above, but substitute all arguments : !?STRING substitute most-recent command from history list : containing STRING -- STRING must be enclosed in : braces if followed by any other characters : !?STRING:N as above, but substitute Nth element, where : 0 = command name, 1 = 1st arg, etc. : !?STRING:$ as above, but substitute last element : !?STRING:* as above, but substitute all arguments : : : Command Editing: : ---------------- : : CMND~e edit CMND using $EDITOR, where CMND may be found : using a history substitution : CMND~v edit CMND using $VISUAL, where CMND may be found : using a history substitution : " ^string1^string2^ substitute string2 for string1 in last command" : command and run it : " g^string1^string2^ globally substitute string2 for string1 in " : last command and run it : !NUMBER:s/string1/string2/ : substitute string2 for string1 in : command NUMBER and run it : !NUMBER:gs/string1/string2/ : globally substitute string2 for string1 in : command NUMBER and run it : !?STRING:s/string1/string2/ : substitute string2 for string1 in last command : containing STRING and run it : !?STRING:gs/string1/string2/ : globally substitute string2 for string1 in last : command containing STRING and run it : : Any command which ends in the string ":p" is treated as a normal : command until all substitutions have been completed. The trailing : ":p" is then stripped, and the command is simply echoed and added to : the history list instead of being executed. : : None of the other colon extensions of the cshell are supported. : : : Shell Environment Variables: : ---------------------------- : : EDITOR editor used by ~e command, default = "ed" : VISUAL editor used by ~v command, default = "vi" : MAIL your system mailbox : PAGER paging program used by history command, default = "more" : PS1 primary prompt : PS2 secondary prompt : history number of commands in history list, default = 22 : histfile file history list is saved in, default = $HOME/.bhistory : savehist number of commands remembered from last bcsh session : aliasfile file of aliased commands, default = $HOME/.baliases : logoutfile file of commands to be executed before termination : inc_cmdno yes/no -- keep track of command numbers or not : noclobber if set, existing files are not overwritten by '>' : iclobber if both noclobber and iclobber are set, the user is : prompted for confirmation before existing files are : overwritten by '>' : : Note: if you are setting either noclobber or iclobber mid-session, : set them to 'yes' : : : Regular Shell Variables: : ------------------------ : : Shell variables may be set via Bourne or cshell syntax, e.g., both : "set foo=bar" and "foo=bar" set a variable called "foo" with the value : "bar". However, all variables are automatically set as environment : variables, so there is no need to export them. Conversely, there : are NO local variables. Sorry, folks. : : A cshell-style "setenv" command is turned into a regular "set" command. : : : The Prompt: : ---------- : : You may, if you wish, have a command executed in your prompt. If : the variable PS1 contains a dollar sign or a backquote, it is : evaluated and the result used as the prompt, provided the evaluation : did not produce a "not found" error message. The two special cases : of PS1 consisting solely of "$" or "$ " are handled correctly. For : example, to have the prompt contain the current directory followed : by a space, enter: : : PS1=\'echo "`pwd` "\' : : You need the backslashed single quotes to prevent the command being : evaluated by the variable-setting mechanism and the shell before it : is assigned to PS1. : : To include the command number in your prompt, enter the command: : : PS1=\'echo "$cmdno "\' : : : Shell Control-Flow Syntax: : -------------------------- : : 'While', 'for', 'case', and 'if' commands entered in Bourne shell : syntax are executed as normal. : : A valiant attempt is made to convert 'foreach' loops into 'for' loops, : cshell-syntax 'while' loops into Bourne shell syntax, and 'switch' : statements into 'case' statements. I cannot guarantee to always get it : right. If you forget the 'do' in a 'while' or 'for' loop, or finish : them with 'end' instead of 'done', this will be corrected. : : Note that cshell-to-Bourne control flow conversions do not take place : if control is nested -- e.g., a 'foreach' inside a 'while' will fail. : : The simple-case cshell "if (condition) command" is turned into Bourne : syntax. Other 'if' statements are left alone apart from making the : 'then' a separate statement, because constructing a valid interactive : cshell 'if' statement is essentially an exercise in frustration anyway. : The cshell and Bourne shell have sufficiently different ideas about : conditions that if is probably best to resign yourself to learning : the Bourne shell conventions. : : Note that since most of the testing built-ins of the cshell are : not available in the Bourne shell, a complex condition in a 'while' : loop or an 'if' statement will probably fail. : : : Bugs, Caveats, etc.: : -------------------- : : This is not a super-speedy program. Be patient, especially on startup. : : To the best of my knowledge this program should work on ANY Bourne : shell -- note that if your shell does not understand 'echo -n' you : will have to re-set the values of '$n' and '$c'. : : This program may run out of stack space on a 16-bit machine where : /bin/sh is not split-space. : : Mail checking is done every 10 commands if $MAIL is set in your : environment. For anything fancier, you will have to hack the code. : : Because commands are stuffed in a file before sh is invoked on them, : error messages from failed commands are ugly. : : Failed history substitutions either give nothing at all, or a : "not found" style of error message. : : A command history is kept whether you want it or not. This may be : perceived as a bug or a feature, depending on which side of bed you : got out on. : : If you want a real backslash in a command, you will have to type two : of them because the shell swallows the first backslash in the initial : command pickup. This means that to include a non-history '!' in a : command you need '\\!' -- a real wart, especially for net mail, : but unavoidable. : : Commands containing an '@' will break all sorts of things. : : Very complex history substitutions may fail. : : File names containing numbers may break numeric history sustitutions. : : Commands containing bizzare sequences of characters may conflict : with internal kludges. : : Aliasing something to "commands;logout" will not work -- if you : want something to happen routinely on logout, put it in the file : specified by $logoutfile, default = $HOME/.blogout. : : Please send all bug reports to ihnp4!utzoo!globetek!chris. : Flames will be posted to net.general with 'Reply-to' set to your : ' path... :-) ' : : : : ************* VERY IMPORTANT NOTICE ************* : : If your shell supports # comments, then REPLACE all the colon 'comments' : with # comments. If it does not, then REMOVE all the 'comment' lines from the : working copy of the file, as it will run MUCH faster -- the shell evaluates : lines starting with a colon but does not actually execute them, so you will : save the read-and-evaluate time by removing them. case "`echo -n foo`" in -n*) n= c="\c" ;; foo) n=-n c= ;; *) echo "Your 'echo' command is broken." exit 1 ;; esac history=${history-22} savehist=${savehist-22} histfile=${histfile-$HOME/.bhistory} logoutfile=${logoutfile-$HOME/.blogout} EDITOR=${EDITOR-ed} VISUAL=${VISUAL-vi} PAGER=${PAGER-more} aliasfile=${aliasfile-$HOME/.baliases} : the alias file may contain 1 blank line, so a test -s will not work case "`cat $aliasfile 2> /dev/null`" in "") doalias=no ;; *) doalias=yes ;; esac if test -s "${sourcefile-$HOME/.bcshrc}" then . ${sourcefile-$HOME/.bcshrc} fi if test -s "$histfile" then cmdno="`set - \`wc -l $histfile\`;echo $1`" cmdno="`expr \"$cmdno\" + 1`" lastcmd="`tail -1 $histfile`" copy=false ohist=$histfile while test ! -w "$histfile" do echo "Cannot write to history file '$histfile'." echo $n "Please enter a new history filename: $c" read histfile copy=true done if $copy then cp $ohist $histfile fi else cat /dev/null > $histfile cmdno=1 lastcmd= fi : keep track of command number as the default inc_cmdno=${inc_cmdo-yes} : default prompts -- PS1 and PS2 may be SET but EMPTY, so '${PS1-% }' syntax : is not used here case "$PS1" in "") PS1="% " ;; esac case "$PS2" in "") PS2="> " ;; esac export histfile savehist history aliasfile EDITOR VISUAL PAGER cmdno PS1 PS2 case "$MAIL" in "") ;; *) mailsize=`set - \`wc -c $MAIL\`;echo $1` ;; esac trap ':' 2 trap exit 3 trap "tail -$savehist $histfile>/tmp/hist$$;uniq /tmp/hist$$ > $histfile;\ rm -f /tmp/*$$;exit 0" 15 getcmd=yes mailcheck= exclaim= echoit= mailprompt= while : do run=yes case "$mailprompt" in "") ;; *) echo "$mailprompt" ;; esac case "$getcmd" in yes) : guess if the prompt should be evaluated or not case "$PS1" in \$|\$\ ) echo $n "$PS1$c" ;; *\`*|*\$*) tmp="`(eval $PS1) 2>&1`" case "$tmp" in *not\ found) echo $n "$PS1$c" ;; *) echo $n "$tmp$c" ;; esac ;; *) echo $n "$PS1$c" ;; esac read cmd ;; esac case "$MAIL" in "") ;; *) : check for mail every 10 commands case "$mailcheck" in 1111111111) mailcheck= newsize="`set - \`wc -c $MAIL\`;echo $1`" if test "$newsize" -gt "$mailsize" then mailprompt="You have new mail" else mailprompt= fi mailsize=$newsize ;; *) mailcheck=1$mailcheck ;; esac ;; esac hist=no case "$cmd" in "") continue ;; sh) sh run=no ;; !!) cmd=$lastcmd echoit=yes getcmd=no continue ;; *:p) cmd="`expr \"$cmd\" : '\(.*\):p'` +~+p" getcmd=no continue ;; foreach[\ \ ]*) while test "$line" != "end" do echo $n "$PS2$c" read line cmd="${cmd};$line" done echo "$cmd" > /tmp/bcsh$$ ed - /tmp/bcsh$$ << ++++ s/end/done/ s/foreach[ ]\(.*\)(/for \1 in / s/)// s/;/;do / w ++++ ;; for[\ \ ]*|while[\ \ ]*) : try to catch the most common cshell-to-Bourne-shell mistakes echo $n "$PS2$c" read line case "$line" in *do) line="do :" ;; *do*) ;; *) line="do $line" ;; esac cmd="${cmd};$line" while test "$line" != "done" -a "$line" != "end" do echo $n "$PS2$c" read line case "$line" in end) line=done ;; esac cmd="${cmd};$line" done echo "$cmd" > /tmp/bcsh$$ ;; if[\ \ ]*) while test "$line" != "fi" -a "$line" != "endif" do echo $n "$PS2$c" read line case "$line" in *[a-z]*then) line="`expr \"$line\" : '\(.*\)then'`;then" ;; endif) line=fi ;; esac cmd="${cmd};$line" done echo "$cmd" > /tmp/bcsh$$ case "`grep then /tmp/bcsh$$`" in "") : fix 'if foo bar' cases ed - /tmp/bcsh$$ << ++++ s/)/);then/ s/.*/;fi/ w ++++ ;; esac ;; case[\ \ ]*) while test "$line" != "esac" do echo $n "$PS2$c" read line cmd="${cmd}@$line" done cmd="`echo \"$cmd\" | tr '@' ' '`" echo "$cmd" > /tmp/bcsh$$ ;; switch[\ \ ]*) while test "$line" != "endsw" do echo $n "$PS2$c" read line cmd="${cmd}@$line" done echo "$cmd" > /tmp/bcsh$$ ed - /tmp/bcsh$$ << '++++' 1,$s/@/\ /g g/switch.*(/s//case "/ s/)/" in/ 1,$s/case[ ]\(.*\):$/;;\ \1)/ 2d 1,$s/endsw/;;\ esac/ g/breaksw/s/// 1,$s/default.*/;;\ *)/ w ++++ cmd="`cat /tmp/bcsh$$`" ;; *!*) hist=yes ;; esac case "$hist" in yes) : deal with genuine exclamation marks, go back and parse again case "$cmd" in *\>![\ \ ]*|*\\!*) cmd="`echo \"$cmd\" | sed -e 's@\\!@REALEXCLAMATIONMARK@g'`" exclaim=yes getcmd=no continue ;; esac : break command into elements, parse each one tmp= for i in $cmd do : find element with !, peel off stuff up to ! case "$i" in !) : most likely a typo for !!, so fix it front= $i=!! ;; !!*) front= i="`expr \"$i\" : '.*\(!!.*\)'`" ;; *!!*) front="`expr \"$i\" : '\(.*\)!!.*'`" i="`expr \"$i\" : '.*\(!!.*\)'`" ;; !*) front= i="`expr \"$i\" : '.*!\(.*\)'`" ;; *) tmp="$tmp$i " continue ;; esac case "$i" in !!*) : want last command rest="`expr \"$i\" : '!!\(.*\)'`" i=$lastcmd ;; -*) : we want to search back through the history list case "$i" in -) rest="`expr \"$i\" : '-\(.*\)'`" i=$lastcmd ;; -[0-9]*) wanted="`expr \"$i\" : '-\([0-9][0-9]*\).*'`" rest="`expr \"$i\" : '-[0-9][0-9]*\(.*\)'`" i="`tail -$wanted $histfile | sed -e "1q"`" ;; esac ;; [0-9]*) : find which number command is wanted wanted="`expr \"$i\" : '\([0-9][0-9]*\).*'`" rest="`expr \"$i\" : '[0-9][0-9]*\(.*\)'`" i="`grep -n . $histfile | grep \"^$wanted\"`" i="`expr \"$i\" : \"${wanted}.\(.*\)\"`" ;; \?*) : find which 'command-contains' match is wanted case "$i" in \?{*}*) wanted="`expr \"$i\" : '?{\(.*\)}.*'`" rest="`expr \"$i\" : '?.*}\(.*\)'`" ;; \?*:*) wanted="`expr \"$i\" : '?\(.*\):.*'`" rest="`expr \"$i\" : '?.*\(:.*\)'`" ;; \?*) wanted="`expr \"$i\" : '?\(.*\)'`" rest= ;; esac i="`grep \"$wanted\" $histfile | tail -1`" ;; *) : find which 'start-of-command' match is wanted case "$i" in {*}*) wanted="`expr \"$i\" : '{\(.*\)}.*'`" rest="`expr \"$i\" : '.*}\(.*\)'`" ;; *:*) wanted="`expr \"$i\" : '\(.*\):.*'`" rest="`expr \"$i\" : '.*\(:.*\)'`" ;; *) wanted="$i" rest= ;; esac i="`grep \"^$wanted\" $histfile | tail -1`" ;; esac : see if we actually found anything to substitute case "$i" in "") badsub="Event not found" break ;; *) badsub=no ;; esac case "$rest" in "") tmp="$front$tmp$i " continue ;; :[0-9]*) : find which element of $i is wanted number="`expr \"$rest\" : ':\([0-9][0-9]*\).*'`" rest="`expr \"$rest\" : ':[0-9][0-9]*\(.*\)'`" : count through $i till we get to the right element counter=0 for element in $i do case "$counter" in $number) break ;; *) counter="`expr \"$counter\" + 1`" ;; esac done case "$counter" in $number) badsub=no ;; *) badsub="Bad command element" break ;; esac tmp="$tmp$front$element$rest " continue ;; :\$*) : spin through $i till we hit the last element rest="`expr \"$rest\" : ':\$\(.*\)'`" for element in $i do : done tmp="$tmp$front$element$rest " continue ;; :\**) : we want all elements except the command itself rest="`expr \"$rest\" : ':\*\(.*\)'`" save=$i set - $i shift case "$*" in "") badsub="No arguments to command '$save'" break ;; *) badsub=no ;; esac tmp="$tmp$front$*$rest " continue ;; :s*|:gs*) : we are doing a substitution -- put / on end if needed case "$rest" in :s/*/*/*|:gs/*/*/*) ;; :s/*/*|:gs/*/*) rest="${rest}/" ;; esac : find what substitution is wanted first="`expr \"$rest\" : ':*s\/\(.*\)\/.*\/.*'`" second="`expr \"$i\" : ':*s/.*/\(.*\)/.*'`" : see if it is a global substitution case "$rest" in :gs*) global=g ;; :s*) global= ;; esac rest="`expr \"$rest\" : '.*/.*/.*/\(.*\)'`" i="`echo \"$i\" | sed -e \"s@$first@$second@$global\"`" : see if subsitution worked case "$i" in "") badsub="Substiution failed" break ;; *) badsub=no ;; esac tmp="$tmp$front$i$rest " continue ;; *) tmp="$tmp$front$i$rest " ;; esac done case "$badsub" in no) ;; *) echo "$badsub" badsub=no continue ;; esac cmd="$tmp" echoit=yes getcmd=no continue ;; *) run=yes ;; esac case "$cmd" in *\^*\^*\^*) : see if the substitution is global case "$cmd" in g*) global=g ;; *) global= ;; esac : put a '^' on the end if necessary case "$cmd" in *\^) ;; *) cmd="${cmd}^" ;; esac : find what substitution is wanted first="`expr \"$cmd\" : '*\^\(.*\)\^.*\^.*'`" second="`expr \"$cmd\" : '*\^.*\^\(.*\)\^.*'`" rest="`expr \"$cmd\" : '*\^.*\^.*\^\(.*\)'`" cmd="`echo \"$lastcmd\" | sed -e \"s@$first@$second@$global\"`$rest" : see if the substitution worked case "$cmd" in "") echo "Substitution failed" continue ;; esac echoit=yes getcmd=no continue ;; *~e) echo "$cmd" | sed -e "s@~e@@" > /tmp/bcsh$$ $EDITOR /tmp/bcsh$$ cmd="`cat /tmp/bcsh$$`" getcmd=no continue ;; *~v) echo "$cmd" | sed -e "s@~v@@" > /tmp/bcsh$$ echo "$lastcmd" > /tmp/bcsh$$ $VISUAL /tmp/bcsh$$ cmd="`cat /tmp/bcsh$$`" getcmd=no continue ;; exec[\ \ ]*) tail -$savehist $histfile>/tmp/hist$$ uniq /tmp/hist$$ > $histfile rm -f /tmp/*$$ echo $cmd > /tmp/cmd$$ . /tmp/cmd$$ ;; login[\ \ ]*|newgrp[\ \ ]*) tail -$savehist $histfile>/tmp/hist$$ uniq /tmp/hist$$ > $histfile rm -f /tmp/*$$ echo $cmd > /tmp/cmd$$ . /tmp/cmd$$ ;; logout|exit|bye) if test -s "$logoutfile" then sh $logoutfile fi tail -$savehist $histfile > /tmp/hist$$ uniq /tmp/hist$$ > $histfile rm -f /tmp/*$$ exit 0 ;; h|history) grep -n . $histfile | tail -$history | sed -e 's@:@ @' | $PAGER continue ;; h[\ \ ]\|*|h[\ \ ]\>*|h\|*|h\>*) cmd="`echo \"$cmd\" | sed -e \"s@h@grep -n . $histfile | tail -$history | sed -e 's@:@ @'@\"`" getcmd=no continue ;; history[\ \ ]*\|*|history[\ \ ]*\>*) cmd="`echo \"$cmd\" | sed -e \"s@history@grep -n . $histfile | tail -$history | sed -e 's@:@ @'@\"`" getcmd=no continue ;; source[\ \ ]*) set - $cmd shift echo . $* > /tmp/cmd$$ . /tmp/cmd$$ run=no ;; wait) wait run=no ;; .[\ \ ]*) echo $cmd > /tmp/cmd$$ . /tmp/cmd$$ run=no ;; cd|cd[\ \ ]*) : check if it will work first, or else this shell will terminate : if the cd dies. If you have a built-in test, you might want : to replace the try-it-and-see below with a couple of tests, : but it is probably just as fast like this. echo $cmd > /tmp/cmd$$ if (sh /tmp/cmd$$) then . /tmp/cmd$$ fi run=no ;; awk[\ \ ]*|dd[\ \ ]*|cc[\ \ ]*|make[\ \ ]*) : these are the only commands I can think of whose syntax : includes an equals sign. Add others as you find them. echo "$cmd" > /tmp/bcsh$$ ;; setenv*|*=*) : handle setting shell variables, turning cshell syntax to Bourne : syntax -- note all variables must be exported or they will not : be usable in other commands echo "$cmd" > /tmp/cmd$$ ed - /tmp/cmd$$ << ++++ g/^setenv[ ]/s/[ ]/@/ g/^setenv@/s/[ ]/=/ g/^setenv@/s/// g/^set/s/// .t. \$s/=.*// s/^/export / w ++++ . /tmp/cmd$$ rm -f /tmp/cmd$$ run=no ;; unset[\ \ ]*|umask[\ \ ]*|export[\ \ ]*|set[\ \ ]*) : handle commands which twiddle current environment $cmd run=no ;; alias|alias[\ \ ]) $PAGER $aliasfile lastcmd=$cmd run=no continue ;; alias[\ \ ]*) case "$cmd" in alias[\ \ ]\|*|alias[\ \ ]\>*) cmd="`echo \"$cmd\" | sed -e \"s@alias@cat $aliasfile@\"`" getcmd=no continue ;; alias[\ \ ]*[\ \ ]*) ;; *) echo "Syntax: alias name command" cmd= continue ;; esac set - $cmd shift cmd="$*" : make sure there is always 1 blank line in file so : unaliasing will always work -- ed normally refuses : to write an empty file echo "" >> $aliasfile cat << ++++ >> $aliasfile $cmd ++++ ed - $aliasfile << '++++' g/alias[ ]/s/// g/^['"]\(.*\)['"]$/s//\1/ g/^/s//alias / w ++++ sort -u -o $aliasfile $aliasfile doalias=yes cmd="alias $cmd" run=no ;; unalias[\ \ ]*) set - $cmd case "$#" in 2) cmd=$2 ;; *) echo "Syntax: unalias alias_name" continue ;; esac ed - $aliasfile << ++++ /^$cmd[ ]/d w ++++ case "`set - \`wc -l $aliasfile\`;echo $1``" in 1) : just removed last alias doalias=no ;; esac run=no ;; *) case "$doalias" in yes) set - $cmd tmp="`grep \"^$1 \" $aliasfile`" case "$tmp" in $1[\ \ ]*) shift cmd=$* set - $tmp shift tmp=$* case "$tmp" in *\$*) : uses positional variables cmd="set - $cmd ; $tmp" getcmd=no continue ;; *) cmd="$tmp $cmd" getcmd=no continue ;; esac ;; *) echo "$cmd" > /tmp/bcsh$$ ;; esac ;; no) echo "$cmd" > /tmp/bcsh$$ ;; esac ;; esac case "$cmd" in *+~+p) cmd="`expr \"$cmd\" : '\(.*\)+~+p'`" echoit=yes run=no ;; esac case "$cmd" in "") continue ;; *) case "$exclaim" in yes) cmd="`echo \"$cmd\" | sed -e 's@REALEXCLAMATIONMARK@!@g'`" echo "$cmd" > /tmp/bcsh$$ ;; esac case "$echoit" in yes) echo $cmd ;; esac case "$run" in yes) case "${noclobber+yes}" in yes) case "$cmd" in *\>![\ \ ]*) ed - /tmp/bcsh$$ << ++++ g/>!/s//>/ w ++++ ;; *\>\>*) ;; *\>*) outfile="`expr \"$cmd\" : '.*>\(.*\)'`" case "$outfile" in \&*) ;; *) set - $outfile outfile="$1" if test -s "$outfile" then case "${iclobber+yes}" in yes) echo $n "Overwrite ${outfile}? $c" read answer case "$answer" in y*) ;; *) echo ':' > /tmp/bcsh$$ ;; esac ;; *) echo "${outfile}: file exists" echo ':' > /tmp/bcsh$$ ;; esac fi ;; esac ;; esac ;; *) case "$cmd" in *\>![\ \ ]*) ed - /tmp/bcsh$$ << ++++ g/>!/s//>/g w ++++ ;; esac ;; esac (trap 'exit 1' 2 3;sh /tmp/bcsh$$) ;; esac case "$cmd" in $lastcmd) ;; *) case "$exclaim" in yes) cmd="`echo \"$cmd\" | sed -e 's@!@\\\\!@g'`" ;; esac cat << ++++ >> $histfile $cmd ++++ lastcmd=$cmd case "$inc_cmdno" in yes) cmdno="`expr \"$cmdno\" + 1`" ;; esac ;; esac ;; esac : The next commented-out line sets the prompt to include the command : number -- you should only un-comment this if it is the ONLY thing : you ever want as your prompt, because it will override attempts : to set PS1 from the command level. If you want the command number : in your prompt without sacrificing the ability to change the prompt : later, replace the default setting for PS1 before the beginning of : the main loop with the following: PS1='echo -n "${cmdno}% "' : Doing it this way is, however, slower than the simple version below. PS1="${cmdno}% " getcmd=yes echoit=no exclaim=no done exit 0 --------------- cut here --------------------- cut here ------------------- -- Christine Robertson {linus, ihnp4, decvax}!utzoo!globetek!chris Money may not buy happiness, but misery in luxury has its compensations...