ubuntu:bash:built-in_variables
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| ubuntu:bash:built-in_variables [2019/11/29 00:37] – created peter | ubuntu:bash:built-in_variables [2019/12/07 01:34] (current) – removed peter | ||
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| - | ====== Ubuntu - Bash - Built-in variables ====== | ||
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| - | When doing scripting in the shell there are a few built-in variables that we can used: | ||
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| - | < | ||
| - | $$ = The PID number of the process executing the shell. | ||
| - | $? = Exit status variable. | ||
| - | $0 = The name of the command you used to call a program. | ||
| - | $1 = The first argument on the command line. | ||
| - | $2 = The second argument on the command line. | ||
| - | $n = The nth argument on the command line. n = 0-9 | ||
| - | $* = All the arguments on the command line. | ||
| - | $# = The number of command line arguments. | ||
| - | </ | ||
ubuntu/bash/built-in_variables.1574987878.txt.gz · Last modified: 2020/07/15 09:30 (external edit)