Superstar's New World

#!/bin/sh
LOG_DIR=~/test/src/log
DELETE_LOG=`date +%Y%m%d --date '1 month ago'`

if [ -d $LOG_DIR/$DELETE_LOG ]; then
    rm -rf $LOG_DIR/$DELETE_LOG
else
    echo "There's no logs..."
fi

$ diff a파일 b파일

$ diff a파일 b파일 > 파일.diff
혹은
$ diff -u a파일 b파일 > 파일.diff

$ diff -urN A디렉토리 B디렉토리

$ patch -p0 < hello.diff

$ diff -urN project1/ project2/ > project.diff
$ cat project.diff
diff -urN project1/hello.c project2/hello.c
--- project1/hello.c
+++ project2/hello.c
...

$ cp project.diff project1/
$ cd project1
$ patch -p1 < project.diff

## color variables
         RED="\[\033[0;31m\]"
       GREEN="\[\033[0;32m\]"
        BLUE="\[\033[0;34m\]"
        CYAN="\[\033[0;36m\]"
     MAGENTA="\[\033[0;35m\]"
      YELLOW="\[\033[0;33m\]"
       BLACK="\[\033[0;30m\]"
        GRAY="\[\033[0;37m\]"
       WHITE="\[\033[0;38m\]"
   LIGHT_RED="\[\033[1;31m\]"
  LIGHT_GREEN="\[\033[1;32m\]"
  LIGHT_BLUE="\[\033[1;34m\]"
  LIGHT_CYAN="\[\033[1;36m\]"
LIGHT_MAGENTA="\[\033[1;35m\]"
LIGHT_YELLOW="\[\033[1;33m\]"
  LIGHT_WHITE="\[\033[1;37m\]"
    NO_COLOR="\[\033[0m\]"

HOSTNAME_SHORT=${HOSTNAME%%.*}
TTY=$(tty); TTY=${TTY#/dev/}

## set shell prompt
shopt -s checkwinsize
PROMPT_UPDATE() {
   case "$PWD" in
       $HOME*) PWD_SHORT="${PWD/$HOME/~}" ;;
       *)      PWD_SHORT="$PWD" ;;
   esac
   PS1="($LOGNAME@$TTY@$HOSTNAME_SHORT)-($PWD_SHORT)"
   if [ ! -n "$COLUMNS" ]; then
       local fillsize=0
   else
       local fillsize=$((${COLUMNS}-${#PS1}))
   fi
   local fill=""
   if [ $fillsize -gt 0 ]; then
       while [ $((${#PROMPT_FILL})) -lt ${COLUMNS} ]; do
           PROMPT_FILL="$PROMPT_FILL-"
       done
       fill="${PROMPT_FILL:0:${fillsize}}"
   elif [ $fillsize -lt 0 ]; then
       fill=""
       local prefix=${PWD_SHORT:0:5}
       local PWD_SHORT="$prefix..${PWD_SHORT:$((2+${#prefix}-${fillsize}))}"
   fi
   PS1="\
$NO_COLOR($RED$LOGNAME$NO_COLOR@$GREEN$TTY$NO_COLOR@$BLUE$HOSTNAME_SHORT$NO_COLOR)$CYAN-$fill$NO_COLOR($MAGENTA$PWD_SHORT$NO_COLOR)$NO_COLOR\r\n($YELLOW\#$NO_COLOR)\\$ "
}

## set PROMPT_COMMAND
PROMPT_COMMAND=PROMPT_UPDATE
PS2="> "
PS4="+ "

## append a xterm's dynamic title command for some terminal types
case $TERM in
   xterm* | cygwin* | screen* | vt*)
   ## Xterm Title
   XTERM_TITLE() {
       echo -ne "\033]0;"
       [ "$LOGNAME" != "netj" ] && echo -n $LOGNAME@
       echo -n $HOSTNAME_SHORT: $PWD_SHORT
       echo -ne "\007"
   }
   # change Xterm title
   export PROMPT_COMMAND="$PROMPT_COMMAND; XTERM_TITLE"
   ;;
esac

# set PROMPT_DATE if not set
# from 2.05b, bash supports custom date formats with \D{...}
PROMPT_DATE=${PROMPT_DATE:-"`date '+%Y-%m-%d %a %T'`"}
PROMPT_DATEFMT=${PROMPT_DATEFMT:-"\D{$CYAN%Y-%m-%d $MAGENTA%a} $NO_COLOR\t"}

...
if [ -f $HOME/.prompt ]; then
       . $HOME/.prompt
fi