Linux exit command Learning

The exitshell exit code has two functions: 1. exit the current shellsh-# exitexitINIT: Entering runlevel: 3 2. directly exit in shell script, so that we can use a specific exit code to indicate the execution status of scripts when writing shell scripts. Sh-# touch/test_exit.shsh-# cat/test_exit.sh #! /Bin/shexit 127 sh-# ls-l/test_exit.sh-rwxr-xr-x 1 root 24 Jan 1/test_exit.shsh-# $? Sh: 0: command not foundsh-#/test_exit.shsh-# $? Sh: 127: command not foundsh-# echo "exit 126">/test_exit.shsh-# cat/test_exit.shexit 126sh-#/test_exit.shsh-# $? Sh: 126: command not foundsh-# vimsh: vim: command not foundsh-# $? Sh: 127: command not found: usually 0, indicating that the command is successfully executed. A value other than 0 indicates that the command fails to be executed.