if[ -n"$empty_string"];then echo"empty string is non_empty" fi if[ -e"${HOME}/.fvwmrc"];then# test to see if ~/.fvwmrc exists echo"you have a .fvwmrc file" if[ -L"${HOME}/.fvwmrc"];then# is it a symlink ? echo"it's a symbolic link elif[ -f"${HOME}/.fvwmrc"]...
echo "$file1 exists." file $file1 exit 3 else mkdir -p $file1 fi 二)写一个脚本,完成如下功能;判断给定的两个数值,孰大孰小;给定数值的方法:脚本参数,命令交互. 解:vim #!\bin\bash # echo "you input integers they are: " read $1 $2 if [ $# -lt 2 ]; then echo "need input two...
id user1 && useradd user1 || echo "user1 exists" 这样写不太方便,shell提供了专门的条件判断结构 if 判断条件;then statement1 statement2 ... fi if 判断条件;then statement1 else statement2 fi if 判断条件;then statement1 .. elif 判断条件2;then statement2 ... else statement3 ... fi NAME...
if grep"^$1\>" /etc/passwd &>/dev/null;then echo"user$1 exists" else useradd$1 echo$1 | passwd --stdin$1 &>/dev/null echo" add user$1 " fi 练习2:通过参数传递一个用户名给脚本,此用户存在,则删除用户以及其家目录和邮件目录 #!/bin/bash # description if [$#-lt 1 ];then echo...
-e file exists (just the same as -a). -f file exists and is a regular file. -g file exists and has its setgid(2) bit set. -G file exists and has the same group ID as this process. -k file exists and has its sticky bit set. ...
Azure CLI를 통해 Bash를 사용하는 방법을 알아봅니다. 쿼리, 형식 출력, 필터, 변수 사용, 루프의 Bash 구성, if/exists/then 및 case 문을 사용합니다.
Size is > 0 bytes [[ -f FILE ]] # File [[ -x FILE ]] # Executable [[ FILE1 -nt FILE2 ]] # 1 is more recent than 2 [[ FILE1 -ot FILE2 ]] # 2 is more recent than 1 [[ FILE1 -ef FILE2 ]] # Same files if [[ -e "file.txt" ]]; then echo "file exists" fi...
if [ $(az group exists--name$resourceGroup) =true]; then az group delete--name$resourceGroup-y# --no-waitelse echo The$resourceGroupresource group does not exist fi 使用"Grep" 来确定资源组是否存在。如果资源组不存在,请创建资源组。
20. Delete Files To delete an existing file, you can use anifstatement to check if the file exists and instruct the bash script to remove it. Start by creating the bash script file: nano deletefiles.sh The following script will create a new file namedcars.txt, and then – with the he...
问bash shell脚本错误:在意外令牌‘$’do\r‘附近出现语法错误ENbash是用C语言写成的，其源码中只使用...