Recipes

• Add a directory to your PATH permanently

  How to put a directory on PATH for good on Debian, why ~/.local/bin needs no configuration at all, and what to do for any other directory.

• Bulk rename a batch of files

  Rename many files at once with a plain bash loop, safely handling spaces and previewing changes before committing.

• Copy files between two machines over SSH

  Transfer a file or directory tree between two machines with scp or rsync, and resume an interrupted transfer without starting over.

• Find and replace across many files

  Replace a string across a directory tree with grep -rl and sed -i, safely for filenames containing spaces, with a dry run and a backup first.

• Find files without the permission denied noise

  Why 2>/dev/null is the wrong fix for find's permission denied errors, and what -readable -prune does instead, including what happens to the exit status.

• Find the largest files on disk

  Locate what is eating your disk space, from a whole filesystem down to one directory.

• Keep a program running after you log out

  How to stop a long job dying when an ssh session ends, what each approach really does about SIGHUP, and an honest recommendation between them.

• Find and kill whatever is using a port

  Identify the process bound to a TCP port that's refusing to let a service start, then stop it.

• Monitor a log file in real time

  Watch a log file as new lines are written, filter it live, and keep watching across log rotation.

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