set -u或者set -o nounset如果存在未声明(赋值)的变量,脚本立即退出执行(交互式shell不退出) set -o pipefail the return value of a pipeline is the status of the last command to exit with a non-zero status, or zero if no command exited with a non-zero status 简而言之,就是如果命令执行失败...
Turning this off will disable brace expansion if you want to have a lower command in the shell evaluate the braces. Emacs - Enables emacs-based editing on the command line for those familiar with it. errexit - If a command in a Bash script exits with a non-zero status code, the entire...
command||exit1 上面的写法表示只要command有非零返回值,脚本就会停止执行。 如果停止执行之前需要完成多个操作,就要采用下面三种写法。 # 写法一command|| {echo"command failed";exit1; }# 写法二if!command;thenecho"command failed";exit1;fi# 写法三commandif["$?"-ne 0 ];thenecho"command failed";exit...
-o option-name Set the variable corresponding to option-name: allexport same as -a braceexpand same as -B emacs use an emacs-style line editing interface errexit same as -e errtrace same as -E functrace same as -T hashall same as -h histexpand same as -H history enable command histor...
$ bash script.sh script.sh:行3:foo:未找到命令 bar 可以看到,Bash 只是显示有错误,并没有终止执行。 这种行为很不利于脚本安全和除错。实际开发中,如果某个命令失败,往往需要脚本停止执行,防止错误累积。这时,一般采用下面的写法。 command||exit1
$ bash script.sh script.sh:行3: foo: 未找到命令 bar 可以看到,Bash 只是显示有错误,并没有终止执行。 这种行为很不利于脚本安全和除错。实际开发中,如果某个命令失败,往往需要脚本停止执行,防止错误累积。这时,一般采用下面的写法。 command || exit 1 ...
command(1) comp_err(1) compare(1) composite(1) compress(1) config.guess(1) config.sub(1) config_data(1) conflict(1) conjure(1) constype(1) continue(1) convert(1) convmv(1) corelist(1) cp(1) cp(1g) cpack(1) cpan(1) cpan2dist(1) cpanp(1) cpio(1) cpp(1) cpp(1) cpu...
Set-CMTSStepRunPowerShellScript [-ExecutionPolicy <ExecutionPolicyType>] [-OutputVariableName <String>] [-PackageId <String>] [-Parameter <String>] [-ScriptName <String>] [-SourceScript <String>] [-SuccessCode <Int32[]>] [-TimeoutMins <Int32>] [-UserName <String>] [-UserPassword <Secur...
2. Check if the script works in a new shell: echo $one $two $three $fourCopy The output proves that the function we created was exported and works even when starting a new shell. Exit When a Command Fails Use the-eoption to instruct a script to exit if it encounters an error during...
The uses ofsetcommand with different options are shown in this part of this tutorial. Example 1: Using the Set Command with -a Option Create a Bash file with the following script that enables the “set –a” command and initialize three variables named $v1, $v2, and $v3. These variabl...