To check if a file is empty in a Bash script, you can use the "-s" test, which returns true if the file exists and has a size greater than zero. If you want to check if a file is empty, you would use the "!" (not or negate) operator with "-s" to negate the test. Here...
Bash Script – Check If File is Empty or Not With the -s Option touch/tmp/f1echo"data">/tmp/f2ls-l /tmp/f{1,2} [ -s /tmp/f1 ]echo$?# output is 1[ -s /tmp/f2 ]echo$?# out put is 0# -s FILE FILE exists and has a size greater than zerohttps://www.computerhope.com...
[ -g FILE ] 如果 FILE 存在且已经设置了SGID则为真。 [ -h FILE ] 如果 FILE 存在且是一个符号连接则为真。 [ -k FILE ] 如果 FILE 存在且已经设置了粘制位则为真。 [ -p FILE ] 如果 FILE 存在且是一个名字管道(F如果O)则为真。 [ -r FILE ] 如果 FILE 存在且是可读的则返回为真。 [ ...
题目 #!/bin/bash If [ ! -s 1] ;then Yes | rm 1 Else Echo “the file is not empty!” Fi Exit 0 执行:./x.sh t.txt(t存在且不空)功能是:___ 相关知识点: 试题来源: 解析 判断文件 .txt 是否为空 反馈 收藏
bash 复制代码 if [ -f /path/to/file ]; then echo "File exists." fi if-else语句 如果需要在满足条件时执行一组命令,在不满足条件时执行另一组命令,可以使用if-else结构: bash 复制代码 if [ 条件 ]; then # 如果条件为真,执行这里的命令 else # 如果条件为假,执行这里的命令 fi ...
First, use the following command to create and open an empty file: nano length.sh Now, paste the following lines of code into the file: #!/bin/bash # Set the variable variable="" # Check if the variable is empty if [ -z "$variable" ]; then ...
Save your code using “Ctrl+S” and quit this editor utilizing the Ctrl+X shortcut. Coming back to the terminal, we are using the Bash instruction to run this Bash file, i.e., empty.sh. On execution, it returns “Empty” because the string “str” is initialized empty in the code,...
[[ `cat a.log |wc -l` -eq 0 ]] && echo "file is empty" javascript 转载 mb5ff40abe496e6 2017-03-29 19:26:00 1292阅读 2评论 shell变量为空或非空 shell变量为空或非空为空:[[$1=""]]非空:[[$1!=""]] shell 转载 yangzhimingg 2020-05-15 13:15:19 6842阅读 ...
/bin/bash etc=`ls /etc | wc -l` var=`ls /var | wc -l` usr=`ls /var | wc -l` num=$[$etc+$var+$usr] echo "All file : $num"vim编辑器 定制vim的工作特性 配置文件:永久有效 全局:/etc/vimrc 个人:~/.vimrc 末行模式:当前vim进程有效...
“`bash if test -f “file.txt”; then echo “file.txt 存在” fi “` 2. 文件检查命令:除了test命令,还有一些特定的命令用于检查文件属性。常见的文件检查命令包括: –-e:检查文件是否存在 –-d:检查是否为目录 –-f:检查是否为普通文件 –-r:检查是否可读 ...