The special variable $? returns the exit status of the last executed command:date &> /dev/nullecho $?CopyCopy The date command completed successfully, and the exit code is zero:0 Copy If you try to run ls on a nonexisting directory the exit code will be non-zero:ls...
When you execute a command or run a script, you receive anexit code. An exit code is a system response that reports success, an error, or another condition that provides a clue about what caused an unexpected result from your command or script. Yet, you might never know about the code,...
1 If we don't set an exit status explicitly, it's assumed to be0or it's the results of the last command that was run. Let's go in here. Let's see how exit statuses work with functions. I am going to create anokfunction. Instead of usingexithere, becauseexitwill cause entire scr...
格式:trap "commands" EXIT 退出时执行commands指定的命令。( A trap on EXIT is executed before the shell terminates.) 退出码(exit status,或exit code)的约定: 0表示成功(Zero - Success) 非0表示失败(Non-Zero - Failure) 2表示用法不当(Incorrect Usage) 127表示命令没有找到(Command Not Found) 126...
问由于超时而关闭bash时运行命令。EN版权声明：本文内容由互联网用户自发贡献，该文观点仅代表作者本人。
187 e2freefrag 188 e2mmpstatus 189 ebtables 190 efibootdump 191 elif 192 envsubst 193 era_invalidate 194 eval 195 exit 196 e2fsck 197 e2undo 198 ebtables-restore 199 efibootmgr 200 else 201 eqn 202 era_restore 203 evmctl 204 expand 205 e2image 206 e4crypt 207 ebtables-save 208 egrep 20...
Bash shell中内置的"command"是一个用于执行命令的内置命令。它的作用是忽略任何与给定命令同名的外部命令,并执行系统中的原始命令。 "command"命令有以下几种常见的用法: 用于执行指定的命令,忽略任何与该命令同名的外部命令。例如,使用"command ls"将执行系统中的原始"ls"命令,而不是可能存在的自定义"ls"命令。
When you execute a command or run a script, you receive anexit code. An exit code is a system response that reports success, an error, or another condition that provides a clue about what caused an unexpected result from your command or script. Yet, you might never know about the code,...
exit is a builtin command and cause the shell to exit with a given exit status. Syntax exit [n] Copy Bash Download n is the exit status of n. If n is omitted,the exit status is that of the last command executed. Post function A function can be called on a EXIT before the ...
Did you know that every command you run in Linux has an exit code? This is true even if a command terminates with an error. Exit values are integer values that range from 0 to 255. A non-zero value, i.e., a value higher than 0, indicates the command exits with an error. ...