Useful Unix commands

1. Find commands

$ find /home/jhl -name "a.c"
$ find /home/jhl -name "a.c" -exec grep -l "main" {} \;
$ find . -name "cyberspace.*" | xargs ls -l
-rw-rw-r--. 1 lij lij 107827 Jul 10 03:30 ./cyberspace.tar.bz2
-rw-rw-r--. 1 lij lij 107858 Jul  9 10:48 ./cyberspace.tar.bz2.orig
$ find ./ -name "cyberspace.*" | xargs rm


2. Find files in current directory excluding sub-directories

$ find /home/jhl -name "*.txt" -maxdepth 1
$ p='/home/jhl'; d='/*'; \
  find "$p" -path "$p$d" -prune -name "*" -type f
$ p='/home/jhl'; d='/*/*'; \
  find "$p" -name "*.c" -type f \( -path "$p$d" -prune -o -print \)
$ p='/home/jhl'; d='/*/*'; \
  find "$p" -name "*.h" -type f ! -path "$p$d"


3. Find and replace

$ find . -type f -exec sed -i 's/catch/repl/g' {} \;
$ find . -name "*.c" -exec grep -l hello {} \; -exec rm {} \;