BASH > créer des options pour les scripts

1. parcourir les options

for arg in "$@" ; do
   shift
   case "$arg" in
      --nom) echo "bonjour $1"
      ;;
      --age) echo "tu as $1 ans"
      ;;
      --help) echo "tu veux de l'aide."
      ;;
      *) echo "aucune option"
         exit 1
      ;;
   esac
done

./monScript.sh --nom "toto" --age 4 --help --hello Hi!
bonjour toto
tu as 4 ans
tu veux de l'aide.

VERIFIER SI IL Y A DES ARGUMENTS

2 arguments

if [ $# -lt 2 ] ; then
   echo "Usage : $0 Signalnumber PID"
   exit
fi

case "$1" in
   1) echo "Sending SIGHUP signal"
      kill -SIGHUP $2
   ;;
   2) echo  "Sending SIGINT signal"
      kill -SIGINT $2
   ;;
   3) echo  "Sending SIGQUIT signal"
      kill -SIGQUIT $2
   ;;
   9) echo  "Sending SIGKILL signal"
      kill -SIGKILL $2
   ;;
   *) echo "Signal number $1 is not processed"
   ;;
esac

voir aussi 4 methods to kill a process.

2. Pattern Match in a File

# Check the given file is exist #
if [ ! -f $3 ] ; then
   echo "Filename given \"$3\" doesn't exist"
   exit
fi

case "$1" in
   # Count number of lines matches
   -i) echo "Number of lines matches with the pattern $2 :"
      grep -c -i $2 $3
   ;;
   # Count number of words matches
   -c) echo "Number of words matches with the pattern $2 :"
      grep -o -i $2 $3 | wc -l
   ;;
   # print all the matched lines
   -p) echo "Lines matches with the pattern $2 :"
      grep -i $2 $3
   ;;
   # Delete all the lines matches with the pattern
   -d) echo "After deleting the lines matches with the pattern $2 :"
      sed -n "/$2/!p" $3
   ;;
   *) echo "Invalid option"
   ;;
esac

Voir aussi ~ expansaion and { } expansion.

3. File type from the Extension

#!/bin/bash
for filename in $(ls) ; do
   # Take extension available in a filename
   ext=${filename##*\.}
   case "$ext" in
      c) echo "$filename : C source file"
      ;;
      o) echo "$filename : Object file"
      ;;
      sh) echo "$filename : Shell script"
      ;;
      txt) echo "$filename : Text file"
      ;;
      *) echo " $filename : Not processed"
      ;;
   esac
done

4. Yes or No

#!/bin/bash

echo -n "Do you agree with this? [yes or no]: "
read yno
case $yno in
   [yY] | [yY][Ee][Ss] )
      echo "Agreed"
   ;;
   [nN] | [n|N][O|o] )
      echo "Not agreed, you can't proceed the installation";
      exit 1
   ;;
   *) echo "Invalid input"
   ;;
esac

5. Startup script

#!/bin/bash

case "$1" in
   'start')
      echo "Starting application"
      /usr/bin/startpc
   ;;
   'stop')
      echo "Stopping application"
      /usr/bin/stoppc
   ;;
   'restart')
      echo "Usage: $0 [start|stop]"
   ;;
esac

./startpcapp start
Starting application
/usr/bin/startpc started

6. tester l’espace disque

#!/bin/bash
# This script does a very simple test for checking disk space.
space=`df -h | awk '{print $5}' | grep % | grep -v Use | sort -n | tail -1 | cut -d "%" -f1 -`
case $space in
   [1-6]*) Message="Tout va bien."
   ;;
   [7-8]*) Message="Va falloir penser à faire un peu de ménage : $space % de libre."
    ;;
   9[1-8]) Message="Ouh la! faut faire du ménage, vite : $space % libre."
   ;;
   99) Message="Le disque est rempli !!! $space %"
   ;;
   *) Message="Apparemment, y'a une partition inexistante..."
   ;;
esac 

echo $Message | mail -s "disk report `date`" monAdresseMail