if [ ! -z err−o!−eapk ]; then 会报出-e无法找到的错误; 而if [ ! -z err]||[!−eapk ]; then 没问题; 整数比较 : -eq 等于,如:if [ "a"−eq"b" ] -ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] -ge 大于等于,如:if [ "a"−ge...
>> file # 将命令的标准输出重定向到文件,追加不覆盖 >| file # 强制输出到文件,即便设置过:set -o noclobber n>| file # 强制将文件描述符 n的输出重定向到文件 <> file # 同时使用该文件作为标准输入和标准输出 n<> file # 同时使用文件作为文件描述符 n 的输出和输入 n> file # 重定向文件描述符...
配置如下：编程语言： 编译器，解释器 编程语言：机器语言，汇编语言、高级语言 静态语言：编译型语言 ...
Here you try to regularly kill (TERM signal) the process nicely after 10.0 seconds after it has started. If it's still running after 20.0 seconds, then send a KILL signal (kill -9). If in doubt, check which signals are supported in your system (kill -l, for example). If this isn'...
* Check whether a /etc/ssh/sshd_config file exists * Create a backup of this file * Edit the file to set certain parameters EOF } backup_sshd_config(){ if [ -f ${file} ] then /usr/bin/cp ${file} ${file}.1 else /usr/bin/echo "File ${file} not found." ...
sbopkg, slackpkg, slapt-{get,src}: Use shorter form of the check if file exists. (3388314) rmmod: Add option completions. (47c49db) testsuite/generate: Generate less linefeeds. (068e422) insmod: Install for insmod.static too. (d02b4e1) mplayer: Add -monitoraspect arg completion. (a90...
Set user id on file or directory. -k Set a sticky bit. -O You are the owner of the file. f1 -nt f2 file f1 is newer than f2. f1 -ot f2 file f1 is older than f2 Comparison Operators Comparison operators are used in bash to compare two strings to check if they are equal or ...
Check if string contains a sub-stringUsing a test:if [[ $var == *sub_string* ]]; then printf '%s\n' "sub_string is in var." fi # Inverse (substring not in string). if [[ $var != *sub_string* ]]; then printf '%s\n' "sub_string is not in var." fi # This works ...
-O You are the owner of the file. f1 -nt f2 file f1 is newer than f2. f1 -ot f2 file f1 is older than f2 Comparison Operators Comparison operators are used in bash to compare two strings to check if they are equal or not. Here, we will list some comparison operators including, ...
if[$disk_size-le 512000 -a$mem_size-le 1024000 ] then mail ‐s"Warning"root <<EOF Insufficient resources,资源不足 EOF fi done 6)猜数字游戏#!/bin/bash # 脚本生成一个 100 以内的随机数,提示用户猜数字,根据用户的输入,提示用户猜对了, ...