A shell script (isEmpty.sh) example to check if a file is empty or not. [code language=”shell”] #!/bin/sh f=’afile.txt’ hasData () { echo "$f has data." ls -l $f cat $f } noData() { echo "$f is empty." ls -l
-s FILE FILE exists and has a size greater than zero 如果文件存在且文件大小大于零,则返回真 -e FILE FILE exists 如果文件存在,则返回真 在shell中通过test指令测试文件是否为空的示例脚本如下: #! /bin/sh if test -s file.txt; then echo "hi" else echo "empty" fi 在shell中,test指令还有另外...
= "0" && echo "Error: You must be root to run this script." && exit 1 # Check parameter. if $# -gt 1 ; then echo "Usage: ./github_pelican_nginx.sh \"commit_comments\"" && exit 1 fi # Run command functions. function ERROR() { echo >/dev/null && echo "$(date +%H:%M:...
Give a directory path and check if it contains any files or not. [code language="shell"] #!/bin/sh DIR='/a/path/to/a/directory/' if [ "$(ls -A $DIR)" ]; then echo "$DIR is not empty" else echo "$DIR is empty" fi [/code]
现在我们来写第二个脚本,名叫name_check.sh,这个会用上用户交互。 第一步:新建文件 代码语言:javascript 代码运行次数:0 运行 AI代码解释 cd~/scripts vim name_check.sh 按i进入插入模式,粘贴以下内容: 代码语言:javascript 代码运行次数:0 运行 AI代码解释 ...
In a script, you would typically use it in an if statement. To negate and check if the folder or file doesnotexist, use either "!" or "-not", and remember to enclose the Test-Path statement in parentheses. Also remember that if the path or folder name contains a space, you need to...
Check if .txt file is empty Check if a process is running check if a process or service is hanging/not responding? Check if a text file is blank in powershell check if computer exist in ou Check if drive exists, If not map Check if Email address exists in Office 365 and if exists...
File Searching Scripting bash find ls 1. Overview Managing directories efficiently is a key aspect of Linux system administration. For example, we may need to check whether a directory is empty or not before performing any operations on it. In this tutorial, we’ll explore different ways that ...
如果if语句后放入一个不能工作的命令,则状态码为非0,且bash shell会跳过then后面的语句。 [22:43:53 root@libin3 libin]# vim shell21 /bin/bash #this is result error if libin then echo "this is error" fi if date then echo "this is success" ...
#! /bin/bash function traverse(){ for file in 'ls $1' do if [ -d $1"/"$file ] then traverse $1"/"$file else echo $1"/"$file fi done } traverse "/usr/local/src" 18. Shell中的字符串截取Shell截取字符串的方法有很多,常用的有以下几种。