Bash shift: Difference between revisions
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=Overview= | =Overview= | ||
This command one number as argument and shifts the [[Bash_Environment_Variables#Positional_Parameters_.241.2C_.242.2C_...|positional parameters]] to the left by that number. The positional parameters from n + 1 to [[Bash_Environment_Variables#.24.23|$#]] are renamed to variable names from $1 to $# - | This built-in command takes one number as argument and shifts the [[Bash_Environment_Variables#Positional_Parameters_.241.2C_.242.2C_...|positional parameters]] to the left by that number. The positional parameters from n + 1 to [[Bash_Environment_Variables#.24.23|$#]] are renamed to variable names from $1 to $# - n + 1. The first n positional parameters are thrown away. | ||
If the number is not present, it is assumed to be 1. | |||
If | If n is zero or greater than [[Bash_Environment_Variables#.24.23|$#]], the positional parameters are not changed and the command has no effect. | ||
Revision as of 20:26, 23 September 2017
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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.