Creation: 19 juin 2013
Mise à jour:
Version: 1.0
Author: Jean-Louis Bicquelet-Salaün
Location: http://jlbicquelet.free.fr
Copyright: (c) 2013 Jean-Louis BICQUELET

---

tests

-eq	numeric EQuality	if [ "$x" -eq "4" ]
-ne	numeric inquality	if [ "$x" -ne "4" ]
-lt	Less Than	if [ "$x" -lt "4" ]
-le	Less than or Equal	if [ "$x" -le "4" ]
-gt	Greater Than	if [ "$x" -gt "4" ]
-ge	Greater than or Equal	if [ "$test" -ge "4" ]
-z	String is zero length	if [ -z "$test" ]
-n	String is not zero length	if [ -n "$test" ]
=	String equality (cf. -eq)	if [ "$test" = "bar" ]
-nt	Newer Than	if [ "$file1" -nt "$file2" ]
-ot	Older Than	if [ "$file1" -ot "$file2" ]
-e	does the file exist	if [ -e /etc/hosts ]
-d	is a Directory	if [ -d /bin ]
-f	is a File	if [ -f /bin/ls ]
-L	is a link	if [ -f /opt/oracle ]
-s	is the file not empty	if [-s /tmp/test]
-r	is a Readable file	if [ -r /bin/ls ]
-w	is a Writable file	if [ -w /bin/ls ]
-x	is an eXecutable file	if [ -x /bin/ls ]

examples:

if test 1 -lt 7
then echo "It's normal."
fi

if test 1 -gt 7
then echo "it's absurde."
fi

if test -e ~/.profile
 then echo "~/.profile exist."
 else echo "~/.profile doesn't exist."
fi

if test -d ~/.profile
 then echo "~/.profile is a directory."
 else echo "~/.profile isn't a directory."
fi

if test -f ~/.profile
 then echo "~/.profile is a filer."
 else echo "~/.profile isn't a file."
fi

if test ~/.exrc -nt ~/.profile
 then "~/.exrcis newer than ~/.profile."
fi

conjonctions

&&	Logical AND	if [ "$test" -ge "0" ] && [ "$test" -le "9"]
||	Logical OR	if [ "$test" -lt "0" ] || [ "$test" -gt "9" ] (not in Bourne shell)
!	Logical NOT	if [ "$test" != "bar" ]

examples:

[ -f test ] && echo "file test exist."

[ -f test ] || echo "file test doesn't exist."

[ ! -f test ] && echo "file test doesn't exist."


if [ -f test ]
  then echo "Le fichier test existe."
else continue
fi


if [ -f test ]
  then continue
else echo "file test doesn't exist."
fi

if [ ! -f test ]
  then echo "file test doesn't exist."
else continue
fi

variables spéciales

$$	PID of current shell	echo "my PID = $$"
$!	PID of last background command	ls & echo "PID of ls = $!"
$?	exit status of last command	ls	echo "ls returned code $?"
$0	Name of current command (as called)	echo "I am $0"
$1	Name of current command’s first parameter	echo "My first argument is $1"
$9	Name of current command’s ninth parameter	echo "My ninth argument is $9"
$@	All of current command’s parameters (preserving whitespace and quoting)	echo "My arguments are $@"
$	All of current command’s parameters (not preserving whitespace and quoting)	echo "My arguments are $"

functions

Function definition

function myfunc() { echo hello }

time and date

date +"%d/%m/%Y"	20/06/2013
date +"%d/%m/%y"	20/06/13
date +"%D"	06/20/13
date "+%a %D %T"	Thu 06/20/13 09:42:28
date +"%A"	Thursday
date +"%a"	Thu
date +"%B"	June
date +"%B"	June
date +"%r"	09:19:32 AM
date +"%p	AM
date +"%u"	4
date +"%T"	09:23:48
date +"%H:%M"	09:24
date +"%H%M"	0924
date +"%H:%M:%S"	09:25:04
date +"%H%M%S"	092530
date +"%I"	09
date +"%W"	24
date +"%j"	171

notes:

• for %u number is from 1 (monday) to 7 (sunday)
• for %p value is AM or PM
• for %W week number
• for %j day of the year number

logs files

To generate log files

logname=`date +%Y%m%d%H%M%S`.log

20130620144817.log