The snippet library.
Small, practical examples. Search by task or narrow things down below.
Add calendar days with GNU date
Linux Commands: Anchor date arithmetic at a fixed UTC date to avoid local daylight-saving ambiguity.
Linux Commands✓ Tested
Append a line to a practice file
Linux Commands: Append a line to a practice file using GNU/Linux commands in an empty practice directory.
Linux Commands✓ Tested
Append a new member to an uncompressed tar
Linux Commands: Use tar -r for an existing uncompressed archive; compressed tar files cannot be appended this way.
Linux Commands✓ Tested
Append a stream to a log file
Linux Commands: Use tee -a to preserve existing log contents.
Linux Commands✓ Tested
Archive filenames safely with null delimiters
Linux Commands: Use find -print0 with tar --null to preserve spaces and embedded newlines in filenames.
Linux Commands✓ Tested
Bound a command execution time
Linux Commands: Use timeout and handle status 124 as an expected time limit.
Linux Commands✓ Tested
Branch on a command’s exit status
Linux Commands: Branch on a command’s exit status using GNU/Linux commands in an empty practice directory.
Linux Commands✓ Tested
Branch on whether a pattern exists
Linux Commands: Use grep -q in a conditional so an ordinary no-match result is not an unhandled failure.
Linux Commands✓ Tested
Calculate a SHA-256 checksum
Calculate a file checksum so you can compare it with a hash from a trusted source and detect changed contents.
checksum✓ Tested
Check available disk space
Show total, used, and available filesystem space for the current directory in human-readable units.
disk✓ Tested
Check memory usage
Show memory and swap totals in human-readable units. The available column estimates memory usable by new applications.
memory✓ Tested
Check the integrity of a gzip stream
Linux Commands: Use gzip -t to verify a compressed file without extracting it.
Linux Commands✓ Tested