/bin/bash die() { echo >&2 -e "\nERROR: $@\n"; exit 1; } run() { "$@"; code=$?; [ $code -ne 0 ] && die "command [$*] failed with error code $code"; } case "1" in "1") run ls /opt run ls /wrong-dir ;; esac 输出: $ ./test.sh apacheds google iptables ...
#!/bin/bash # 定义要运行的命令 command_to_run="your_command_here" # 设置最大重试次数 max_attempts=3 # 设置初始重试次数 attempts=0 # 循环运行命令直到成功或达到最大重试次数 while true; do # 运行命令 $command_to_run # 检查命令的退出状态码 exit_code=$? # 如果命令成功执行,退出循环 if ...
exit 0 # Exit with code 0 indicating success Output: ad@DESKTOP-3KE0KU4:~$ ./test1.sh 12 3 Result of division: 4.00 ad@DESKTOP-3KE0KU4:~$ ./test1.sh 12 0 Error: Division by zero ad@DESKTOP-3KE0KU4:~$ ./test1.sh 0 12 Result of division: 0 Explanation: In the exercise ab...
检测bash脚本中的程序错误可以使用以下方法: 1. 使用shellcheck工具。shellcheck是一个静态分析工具,可以检测bash脚本中的常见错误,例如语法错误、不安全的用法、可疑的用法等...
exit命令用于退出当前shell,在shell脚本中可以终止当前脚本执行。 常用参数 格式:exit n 退出。设置退出码为n。(Cause the shell to exit with a status of n.) 格式:exit 退出。退出码不变,即为最后一个命令的退出码。(If n is omitted, the exit status is that of the last command executed. ) ...
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); ...
several years ago I needed to test ReaR code in bash 3 and I needed RHEL 5 machines for that, RHEL 6 has bash 4. Member schlomo commented Feb 21, 2023 I just added via d0e2ea6 a little tool to the ReaR sources to make such checks simple: $ tests/run-in-docker : centos:5 -...
exec {sleep_fd}<> <(:) while some_quick_test; do # equivalent of sleep 0.001 read -t 0.001 -u $sleep_fd done检查一个命令是否在用户的PATH中# 有3种方法可以使用,任何一种都正确。 type -p executable_name &>/dev/null hash executable_name &>/dev/null command -v executable_name &>/...
文件名: /tmp/mytest.txt 请输入内容,输入END结束 > Hello World! > 2nd line. > 3rd line. > END ]# cat /tmp/mytest.txt Hello World! 2nd line. 3rd line. 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 字符串详解 序列
set -e ! ((1)) echo exit-code=$? # 输出:exit-code=1 这行显示了,虽然上个命令退出码为1 nounset 使得展开unset的变量时报错。快捷形式:-u -- 如果有args则将args设置为位置参数,没有则unset位置参数 - 同上,但没有args时什么也不做 shift [n] 位置参数左移出n个,默认为1。当n大于$#或小于...