Difference between revisions of "$?"
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| − | + | <code>[[echo $?]]</code> prints the [[exit status]] of the last executed command in the terminal. The exit status is a numeric value that indicates whether the command completed successfully or encountered an error. A value of [[0]] indicates success, while non-zero values indicate an [[error]]. | |
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echo $? | echo $? | ||
1 | 1 | ||
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| + | [[apt -qqq update -y && apt -qqq upgrade -y; echo $?]] | ||
== Related == | == Related == | ||
* <code>[[exit]]</code> | * <code>[[exit]]</code> | ||
| + | * <code>[[$]]</code> | ||
| + | * <code>[[apt update]]</code> | ||
== See also == | == See also == | ||
| − | |||
* {{set}} | * {{set}} | ||
* {{Bash}} | * {{Bash}} | ||
[[Category:Bash]] | [[Category:Bash]] | ||
Latest revision as of 12:17, 26 September 2023
echo $? prints the exit status of the last executed command in the terminal. The exit status is a numeric value that indicates whether the command completed successfully or encountered an error. A value of 0 indicates success, while non-zero values indicate an error.
Examples[edit]
mkdir -p /path/to/root/in/macos mkdir: cannot create directory ‘/path’: Read-only file system
-p, --parents makes parents directories if needed and no error if existing echo $? 1
apt -qqq update -y && apt -qqq upgrade -y; echo $?
Related[edit]
See also[edit]
set, unset, set -o, set -x, set -e, set -E, set +b, set -u, $?, exit, return, trap, PostgreSQL SETBash [ -c ],alias,&&, Bash history, Autocompletion,set,unset,export,.bash_aliases, .bashrc and .bash profile,PS1,echo,brace expansion, Function,shopt,trap,set -e,source,PATH,complete,disown,.hushlogin,.bashrc,builtin,eval,set,$PATH,$HOME,TZ,.profile,-e, -i,Builtin (Bash),mapfile,~, return (Bash), for, until,declare, dirname, basename, functions.sh, Bash arithmetic expansion,shift, bash --rcfile, readonly
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