#Scripting

6 snippets

• Bash

  Retry a shell command with backoff

  Re-run a flaky command a few times with increasing delays and a clear failure exit code.

• Bash

  Parse command-line flags with getopts

  Handle -v, -o FILE and -h in a bash script with getopts and a usage message.

• Bash

  Run commands in parallel with xargs

  Process many files concurrently with xargs -P, safely handling spaces and newlines in names.

• Bash

  Timestamped logging functions for scripts

  Small log, warn and die helpers that write ISO timestamps to stderr and keep stdout clean for data.

• Bash

  Clean up temporary files with trap

  Create a temp directory and guarantee it is removed when the script exits, fails or is interrupted.

• Bash

  Check that required commands are installed

  Fail early with a helpful message when a script depends on tools that are missing.