directory="./BashScripting" # bash check if directory exists if [ -d $directory ]; then echo "Directory exists" else echo "Directory does not exists" fi 1. 2. 3. 4. 5. 6. 7. 8. 9. 9.2. Nested if/else #!/bin/bash
The test command also has a logical "not" operator, which can get a TRUE answer when you need to test whether a file does not exist. Check if the file exists Run one of the following commands to check if the file exists: Check if the directory still exists The -d operator allows you...
执行命令区域，否则 不进入循环，介绍while 命令 行3，执行命令区域，这些命令中，Bash，Unix shell的...
#文件测试操作-d FILE_NAM # TrueifFILE_NAM is a directory-e FILE_NAM # TrueifFILE_NAM exists-f FILE_NAM # TrueifFILE_NAM existsandis a regular file-r FILE_NAM # TrueifFILE_NAM is readable-s FILE_NAM # TrueifFILE_NAM existsandisnotempty...
Check a file exists 1 2 3 4 5 6 7 1. 2. 3. 4. 5. 6. 7. #!/bin/bashif [[ -e /tmp/adb.log ]]then echo "Exists"else echo "Not Exists"fi 1. Check Empty String 1 2 3 4 5 6 1. 2. 3. 4. 5. 6. if [[ -z "$emptyString" ]]then echo "Empty"else echo "Not...
Why you should not use the || and && operators instead of a Bash If Statement? Detailed Examples & FAQ How to check if a variable exists or is “null”? How to check if a file exists? How to check if a directory exists? How to check if a command succeeds or failed? How to do...
if [ -d "/Applications/Install OS X Yosemite.app" ] $ then$ echo "Application is already downloaded and ready to continue."$ sleep 4$ break$ elif [ -f "$script_dir\Yosemite.tar.gz" ]$ then$ echo -n "Extracting archive to Applications directory... "$ ...
mkdir:Make Directory(创建目录) touch:touch man:Manual su:Swith user(切换用户) cd:Change directory ls:List files mkfs:Make file system fsck:File system check uname:Unix name lsmod:List modules mv:Move file cp:Copy file ln:Link files
-d file If file exists and is a directory. -e file If file exists. -f file If file exists and is a regular file. -g file If file exists and its set-group-id bit is set. -h file If file exists and is a symbolic link. -k file If file exists and its sticky-bit is set -...
if [ ! -z err−o!−eapk ]; then 会报出-e无法找到的错误; 而if [ ! -z err]||[!−eapk ]; then 没问题; 整数比较 : -eq 等于,如:if [ "a"−eq"b" ] -ne 不等于,如:if [ "a"−ne"b" ] -gt 大于,如:if [ "a"−gt"b" ] ...