How to determine whether a file exists in linux shell

In the Linux shell, you can use the if statement and the "-e filename" expression to determine whether the file exists. The specific syntax is "if [-e filename]; then echo "file exists"; else echo "file ";fi" does not exist.

#The operating environment of this tutorial: linux5.9.8 system, Dell G3 computer.

Determine the basic format of the file. [operator file or directory]

• -e filename True if filename exists

• -d filename True if filename is a directory

• -f filename True if filename is a regular file

• -L filename True if filename is a symbolic link

• -r filename True if filename is readable

• -w filename True if filename is readable Write, true

• -x filename True if filename is executable

• -s filename If file length is not 0, It is true

• -h filename If the file is a soft link, it is true

Common examples

If a file exists, delete it

if [ -f trials ]; then rm ${result_path}trials; fi

If there is no folder, create it

if [ ! -d $result_name ];then
   mkdir -p $result_name
fi

The shell command determines whether the file or folder exists, first look directly at the example:

#!/bin/sh
 
#判断文件存在，判断是否为文件夹等
testPath="/Volumes/MacBookProHD/Mr.Wen/08 shell命令"
testFile="/Volumes/MacBookProHD/Mr.Wen/08 shell命令/fileWen"
 
#判断文件夹是否存在 -d
if [[ ! -d "$testPath" ]]; then
 echo "文件夹不存在"
else
 echo "文件夹存在"
fi
 
#判断文件夹是否存在，并且具有可执行权限
if [[ ! -x "$testFile" ]]; then
 echo "文件不存在并且没有可执行权限"
else
 echo "文件存在并有可执行权限"
fi
 
#判断文件是否存在
if [-e "$testFile"]; then
 echo "文件不存在"
else
 echo "文件存在"
fi

Related recommendations: "Linux Video Tutorial"

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