# your command heretestVal=$?if[$testVal-ne 0];thenecho"There was some error"fiexit$testVal 可以使用$?上的test來完成速記符號命令。此程式碼的最小示例可以是: # your command heretest$?-eq 0||echo"There was some error" 為了更好地理解上述陳述,我們可以對其進行擴充套件。
Bash代码 ./mycommand.sh EXCODE=$? if [ "$EXCODE" == "0" ]; then echo "O.K" fi 表格D-1. "保留的"退出码 通过上面的表, 我们了解到, 退出码1 - 2, 126 - 165, 和255 [1] 都具有特殊的含义, 因此应该避免使用用户指定的退出参数. 如果脚本使用exit 127作为退出语句, 那么可能就会在故...
(If n is omitted, the exit status is that of the last command executed. ) 格式:$? 上一个命令的退出码。 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...
command `test` can not 要work in any posix-compliant shell?用[, 加上双引号: if [ "$testv" = '!' ]; then false true [[ 某东西(而非条件) ]] , 其status code是0: 这个确实可以看到输出: if 某某 ; then 某某 ; fi 圆括号/Parentheses/( subshell bash里, (POSIX里的定义基本一样)...
fix! bad command escaping bug#5 HELP $ bashtest --help usage: bashtest [-h] [--exitcode] [-v] [-q] [--debug] [--version] [file [file ...]] BashTest is a UNIX command-line tool for running text-based bash tests. positional arguments: file Input file (by default uses *.bas...
yum -y install crontabs 2 权限问题比如:脚本没有x执行权限,解决方法:增加执行权限,或者用bash abc.sh的方法执行也有可能crontab任务所属的用户对某个目录没有写权限...有可能是因为crontab使用的sh未正确识别路径,比如:以root身份登录shell后执行一个/root/test.sh,只要执行 ./test.sh 就可以了。...验证后...
The way to check the exit code in Bash is by using the$?command. If you wish to output the exit status, it can be done by: # your command heretestVal=$?echotestVal We know that non-zero exit codes are used to report errors. If we want to check for errors in general, we can...
of the last child in the pipeline is the significant one. If the command or job was terminated by a signal, note that value also. */ termination_state = (job != NO_JOB) ?job_exit_status(job)一般通过这个流程来确定返回值。 :process_exit_status(child->status); ...
检测:env x='() { :;}; echo vulnerable’ bash -c “echo this is a test” UBuntu修复: apt-get update apt-get install...bash 修复之后: env x='() { :;}; echo vulnerable’ bash ...
$ ./test.sh apacheds google iptables ls: cannot access /wrong-dir: No such file or directory ERROR: command [ls /wrong-dir] failed with error code 2 我测试了带有多个参数,bash变量作为参数,带引号的参数...的各种命令,但该run函数并未破坏它们。到目前为止,我发现的唯一问题是运行回声,但该回声...