-s file file exists and is not empty -w file You have write permission on file -x file You have execute permission on file, or directory search permission if it is a directory -N file file was modified since it was last read -O file You own file -G file file's group ID...
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 $file ] then echo "File exists" else echo "File not exists" fi 结果 The file ...
#文件测试操作-d FILE_NAM # TrueifFILE_NAM is a directory-e FILE_NAM # TrueifFILE_NAM exists-f FILE_NAM # TrueifFILE_NAM existsandis a regular file-r FILE_NAM # TrueifFILE_NAM is readable-s FILE_NAM # TrueifFILE_NAM existsandisnotempty...
参数可以是以下任意一项:-e: Returns true value, if file exists -f: Return true value, if file exists and regular file -r: Return true value, if file exists and is readable -w: Return true value, if file exists and is writable -x: Return true value, if file exists and is executable...
bash 中的 source 命令用于在当前 bash 环境下读取并执行 FileName.sh 中的命令。 source test.sh . test.sh 引号 双引号(") “STRING” 将会阻止(解释)STRING 中大部分特殊的字符。后面的实验会详细说明。 单引号(’) ‘STRING’ 将会阻止 STRING 中所有特殊字符的解释,这是一种比使用"更强烈的形式。后面...
我有一个python脚本,它需要检查日志文件是否为空或其中是否有日志。我使用os.system来运行bash命令,找到这个命令是为了查看文件是否为空:thenelseecho "File empty"我试着在os.system命令的一 浏览0提问于2020-11-11得票数 0 2回答 无法运行bash脚本示例从“linux命令行,一个完整的介绍,第二” 、、、 /bin/...
TestFile1 does not exist or is empty. 向文件添加一些内容,然后再测试一次: [student@studentvm1 testdir]$ File="TestFile1" ; echo "This is file $File" > $File ; if [ -s $File ] ; then echo "$File exists and contains data." ; else echo "$File does not exist or is empty." ...
-s FILE_NAM # True if FILE_NAM exists and is not empty -w FILE_NAM # True if FILE_NAM has write permission -x FILE_NAM # True if FILE_NAM is executable 字符串测试操作 -z STRING # True if STRING is empty -n STRING # True if STRING is not empty ...
echo "$a : The string is not empty" else echo "$a : The string is empty" fi 1. 2. 3. 4. 5. 6. 7. 8. 文件比较运算符 如下例: #!/bin/bash file="/test.sh" # 由于没有给出条件,所以返回true if [ ! ] then echo "File exists" ...
[ -f FILE ] True if FILE exists and is a regular file. [ -d FILE ] True if FILE exists and is a directory. [ -s FILE ] True if FILE exists and not empty (size more than 0). [ -r FILE ] True if FILE exists and is readable. [ -w FILE ] True if FILE exists and is ...