Check if the directory still exists The -d operator allows you to test if a file is a directory. For example, to check if the /etc/filetocheck directory exists, you can use: NOTE: You can also use double bracket
if file exists and regular file -r: Return true value, if file exists and is readable -w: Return true value, if file exists and is writable -x: Return true value, if file exists and is executable -d: Return true value, if exists and is a directory ...
问BASH - if语句不能正常工作EN解决方法如下 修改/etc/udev/rules.d/70-persistent-net.rules 将...
/bin/bashfile="example.txt"if[ -e$file];thenecho"File exists."elseecho"File does not exist."fi 在这个示例中,脚本检查example.txt文件是否存在。 6. 组合条件 在Bash 中,可以使用逻辑运算符组合多个条件: 逻辑与:-a或&& 逻辑或:-o或|| 逻辑非:! 示例: #!/bin/bashnum=8if[$num-gt 5 ] &&...
bash allows two synonyms for .bash_profile: .bash_login, derived from the C shell’s file named .login, and .profile, derived from the Bourne shell and Korn shell files named .profile. Only one of these three is read when you log in. If .bash_profile doesn’t exist in your home di...
在bash脚本编程中,条件结构体使用if语句和case语句两种句式。 if语句 单分支if语句 if TEST; then CMDfi 1. 2. TEST:条件判断,多数情况下可使用test命令来实现,返回值为0的话则执行CMD,否则就离开该条件结构体,脚本继续往下执行。 [root@c7-server ~]# cat test.sh#!/bin/bashif id zwl &> /dev/null...
Line 20, if the directory doesn’t exist, then try to create it on line 21. If directory creation fails, then exit with an error. On line 27, after running each background job, I capture the PID and associate that with the machine (1:1 relationship). ...
if [ -f "$MyFile" ]; then echo "$MyFile exists." else echo "$MyFile does not exist." fi Running the script results in the following output: 22. Check Inodes and Disk Usage Inodes represent data units on a physical or virtual server. Each text file, video, folder, HTML file, or...
/bin/bashif[ $# -ne2];thenecho"You must input exat 2 arguments."exit1fiif[ ! -e $1-o ! -e $2];thenecho"File $1 or/and $2 doesn't/don't exist[s]."exit2filine1=$(wc-l $1|cut-d""-f1) line2=$(wc-l $2|cut-d""-f1)echo"The lines of $1 is $line1"echo"The...
See what it looks like if we do something that intentionally won't work. If youlson a folder that doesn't exist, it will return an error. $lsnoexistls: noexist: No suchfileor directory Let's see what the exit status was. $echo$?1 ...