/bin/bash[-snewFile.txt ] &&echo"file has something"||echo"file is empty" 该命令等同于我们之前使用的命令。 我们还可以使用test -s命令查找给定目录中的所有空文件: #!/bin/bashforfilein*.txt;doif[ !-s$file];thenecho$file;fi;done 上述命令将打印目录中所有空 .txt 文件的名称。 只需将 ....
abc : The string is not empty 文件测试运算符 实例: #!/bin/bash file="/home/shiyanlou/test.sh" if [ -r $file ] then echo "The file is readable" else echo "The file is not readable" fi if [ -e $file ] then echo "File exists" else echo "File not exists" fi 结果 The file ...
-empty 查找空文件 备注:写入一个10M大小的文件 dd if=/dev/zero of=文件名 bs/M(单位)=count=10 -user 用户名 查找属于指定用户的文件 -group 组名 (指定用户组) -nouser 没有属主的文件 -nogroup 没有属组的文件 -newer 文件名 查找比文件更新的文件 -anewer 访问时间 -cnewer 修改时间 -amin n ...
How to Check if File exists and is Empty in Bash When working with shell scripts, it’s important to be able to check if a file exists and if it’s empty or not. This is especially useful when automating tasks that rely on specific files being present and non-empty, here is an exam...
; if ($content === false) { echo '无法读取文件内容'; } elseif (strlen($conte...
ping-c1$ipif[$?-eq0];then echo"Machine is giving ping response"elseecho"Machine is not pinging"fielseecho"IP Address is empty"fi $./ipaddr.sh Enter the Ipaddress10.176.191.106Pinging10.176.191.106with32bytesofdata:Reply from10.176.191.106:bytes=32time<1msTTL=128Ping statisticsfor10.176.191.10...
printf"\n"if["$str1"="$str2"];then echo'str1 = str2'elseecho'str1 <> str2'fi 注: -n即-not empty判断字符串非空,-z即-zero判断字符串为空,=判断字符串相同(判断字符串时,记得要加双引号) 运行结果: 代码语言:javascript 代码运行次数:0 ...
testfile [root@0x1e61 ~]# rm -iR New_dir/ rm: descend into directory ‘New_dir/’? y rm: remove regular empty file ‘New_dir/testfile’? y rm: remove directory ‘New_dir/’? n [root@0x1e61 ~]# ls -FR New_dir/ New_dir/: ...
TestFile1 does not exist or is empty. 现在创建一个空文件用来测试: [student@studentvm1 testdir]$ File="TestFile1" ; touch $File ; if [ -s $File ] ; then echo "$File exists and contains data." ; else echo "$File does not exist or is empty." ; fi ...
if[ -n "$mystack" ];then cd ${mystack%% *} echo "$PWD", stack is [$mystack] else echo "stack empty, still in $PWD." fi } 例如,我们要求命令带有参数,除了使用{1?"<message"}以外,下面给出更可读的方式: if [ -z "$1" ]; then ...