18 Dec 08 Remembering The Order Of Time/Date Fields For Cron
If you have a hard time remembering the order of the times/dates fields of a crontab record this header might help you. I use this on all of my crontabs. Each value, if tab seperated should line up under the correct heading.
# #min hr day mon dayofwk cmd # #-------------------------------------------------------------------------------
18 Dec 08 Remembering The Shell’s Special Variables
I can never seem to remember what all of these default parameter variables are. I found this small shell script that prints them out when I forget.
#!/bin/sh -vx ####################################################### # example_1.1 (c) R.H.Reepe 1996 March 28 Version 1.0 # ####################################################### echo "Script name is [$0]" echo "First Parameter is [$1]" echo "Second Parameter is [$2]" echo "This Process ID is [$$]" echo "This Parameter Count is [$#]" echo "All Parameters [$@]" echo "The FLAGS are [$-]"It produces output like this:
#!/bin/sh -vx ####################################################### # example_1.1 (c) R.H.Reepe 1996 March 28 Version 1.0 # ####################################################### echo "Script name is [$0]" + echo 'Script name is [/home/me/bin/shellhelp]' Script name is [/home/me/bin/shellhelp] echo "First Parameter is [$1]" + echo 'First Parameter is []' First Parameter is [] echo "Second Parameter is [$2]" + echo 'Second Parameter is []' Second Parameter is [] echo "This Process ID is [$$]" + echo 'This Process ID is [15190]' This Process ID is [15190] echo "This Parameter Count is [$#]" + echo 'This Parameter Count is [0]' This Parameter Count is [0] echo "All Parameters [$@]" + echo 'All Parameters []' All Parameters [] echo "The FLAGS are [$-]" + echo 'The FLAGS are [hvxB]' The FLAGS are [hvxB]
