Linux, Virtualization and whatever I find interesting ... https://www.eanderalx.org/ 2026-04-30T06:38:43+00:00 https://www.eanderalx.org/ https://www.eanderalx.org/_media/wiki/dokuwiki.svg text/html 2013-03-23T17:24:52+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.eanderalx.org/bashscr/calculate?rev=1364059492&do=diff Calculate in bash * If you want to calculate with an integer it's possible without using other programs. * For example 34+23=57 COUNT1="34" COUNT2="23" echo $[$COUNT1 + $COUNT2] * If you want to move the decimal point one digit to the left than you will have to use modulo. text/html 2013-03-23T17:25:50+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.eanderalx.org/bashscr/check_empty_var?rev=1364059550&do=diff Check for empty variables * If you want to check for a empty bash variable you can do this like given here: # if VAR is empty if [ "x$VAR" == "x" ];then ... fi * When $VAR is empty the Statement in the if-clause is true text/html 2013-03-23T17:22:41+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.eanderalx.org/bashscr/functions?rev=1364059361&do=diff Bash - Functions * How to use functions in bash * Here an example: you can pass values returned by programms as parameter to check them. #Functions====================================== function check() { FC=$1 if [ $FC != "0" ];then echo -e "--> ERROR\n" else echo -e "--> OK\n" fi } #============================================ text/html 2013-04-02T13:48:03+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.eanderalx.org/bashscr/parameter?rev=1364910483&do=diff Bash - Parameters * The first parameter passed to the script is $1, the second $2 and so on * If you want to to check more then one possibilities of parameter passed to the script then a case is useful case "$1" in start) # start command 1 command 2 command 3 ;; stop) # stop command 1 command 2 command 3 ;; *) # anything other echo "Use: {start|stop}" >&2 exit 1 ;; esac text/html 2013-03-23T19:21:12+00:00 Anonymous (anonymous@undisclosed.example.com) https://www.eanderalx.org/bashscr/start?rev=1364066472&do=diff Bash-Scripting Recent Posts