Results for “command substitution”
Small, practical examples. Search by task or narrow things down below.
Read the target stored in a symbolic link
Linux Commands: Use readlink without resolving the target path.
Linux Commands✓ Tested
Remove a leading directory while extracting
Linux Commands: Use strip-components only after inspecting a trusted archive layout.
Linux Commands✓ Tested
Remove adjacent duplicate lines
Linux Commands: Remove adjacent duplicate lines using GNU/Linux commands in an empty practice directory.
Linux Commands✓ Tested
Remove an empty directory only
Linux Commands: Use rmdir so a directory containing files cannot be removed accidentally.
Linux Commands✓ Tested
Remove blank or whitespace-only lines
Linux Commands: Use a POSIX character class so tabs and spaces are handled together.
Linux Commands✓ Tested
Remove carriage-return characters
Linux Commands: Use tr -d to remove CR characters from Windows-style line endings.
Linux Commands✓ Tested
Rename a file with mv
Linux Commands: Rename a known file in the current directory and inspect its new contents.
Linux Commands✓ Tested
Rename a practice file
Linux Commands: Rename a practice file using GNU/Linux commands in an empty practice directory.
Linux Commands✓ Tested
Reorder fields with a capture group
Linux Commands: Use extended regular expressions and backreferences to rearrange a known format.
Linux Commands✓ Tested
Replace every occurrence in a string
Substitute text directly with Bash parameter expansion.
replace✓ Tested
Replace text in a pipeline
Linux Commands: Replace text in a pipeline using GNU/Linux commands in an empty practice directory.
Linux Commands✓ Tested
Restore an environment value after temporary use
PowerShell: Use finally so temporary process configuration does not leak to subsequent work; remove the entry when it was originally absent.
PowerShell✓ Tested