Bash shift: Difference between revisions
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* http://tldp.org/LDP/Bash-Beginners-Guide/html/sect_09_07.html | |||
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This built-in command takes one number as argument and shifts the [[Bash_Built-In_Variables#Positional_Parameters_.241.2C_.242.2C_...|positional parameters]] to the left by that number. The positional parameters from n + 1 to [[Bash_Built-In_Variables#.24.23|$#]] are renamed to variable names from $1 to $# - n + 1. The first n positional parameters are thrown away. | |||
If the number is not present, it is assumed to be 1. | |||
If n is zero or greater than [[Bash_Built-In_Variables#.24.23|$#]], the positional parameters are not changed and the command has no effect. | |||
Latest revision as of 01:40, 24 September 2017
External
Internal
Overview
This built-in command takes one number as argument and shifts the positional parameters to the left by that number. The positional parameters from n + 1 to $# are renamed to variable names from $1 to $# - n + 1. The first n positional parameters are thrown away.
If the number is not present, it is assumed to be 1.
If n is zero or greater than $#, the positional parameters are not changed and the command has no effect.