Bash

bash script snippets

file renaming

Rename all *.jpg files in a folder to 0001.jpg, 0002.jpg, etc.

#!/bin/bash
a=1
for i in *.jpg; do
  new=$(printf "%04d.jpg" "$a") #04 pad to length of 4
  mv -i -- "$i" "$new"
  let a=a+1
done

file viewing

List all files and show their contents with the filename as the header ==

$ for f in *; do \
  if [ -f "$f" ]; then \
  echo ":::::::::::::: $f ::::::::::::::"; \
  cat "$f"; \
  echo ""; \
  fi;
  done