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Perform a command several times.
for {variable} in {item1 item2 ...}; do {echo "Loop is executed"}; done
for {variable} in {{from}..{to}..{step}}; do {echo "Loop is executed"}; done
for {variable} in {path/to/file1 path/to/file2 ...}; do {echo "Loop is executed"}; done
for {variable} in {path/to/directory1/ path/to/directory2/ ...}; do {echo "Loop is executed"}; done
for {variable} in */; do (cd "${variable}" || continue; {echo "Loop is executed"}) done
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