The first concern you should tackle is whether your regular file or directory still exists in Bash script. To answer this question, you’ll need to do the test command. If you want to check if your file exists, you’ll need to use the “-f” file option. Make sure to indicate which...
Note:If you need to check if a directory/filedoes not existyou can just add thenot logical operator(!) inside the[operator. For example:if [ ! -d "$directory" ]. Method 2: ThetestCommand To use thetestcommand to check if a directory exists in Bash, you can use the following syntax...
Check if File Exists inbash The easiest way to check if a file exists is to use thetestcommand. With-f <file-name>option, thetestcommand returns true if the specified file exists. FILE=/etc/pam.conf if test -f $FILE; then echo "$FILE exists" fi Alternatively, you can use thebash'...
When writing Shell scripts, you may find yourself in a situation where you need to perform an action based on whether a file exists or not. In Bash, you can use the test command to check whether a file exists and determine the type of the file....
And, if the Neovim configuration directory does not exist, I create it using themkdircommand. The second check is a similar check, for the Neovim initial configuration file. Since I am concerned with the check only if the file does not exist, I add the logical NOT operator (!) here too...
Use the which command to check if the specified bash command exists.Use which Command 1 2 3 4 5 6 7 if which wget > /dev/null; then echo "wget command exists." else echo "wget command does not exist." fioutput 1 2 3 wget command exists...
6 Check if file exists [BASH] 65 Always gives false even though file exists and is not empty 2 If File Exist is always false 2 Bash - File existence providing incorrect results 0 Bash command to check if file exists doesn't work though the file name is matching 0 Test if a...
#!/bin/bash FILE=$1 if [ ! -f "$FILE" ] then echo "File $FILE does not exist" fi The relevant man page is man test or, equivalently, man [ -- or help test or help [ for the built-in bash command. Alternatively (less commonly used) you can negate the result of test using...
exists("myfile.txt")) Finally, if you want to create an empty file, you can run the command: file.create("mynewfile.txt") How to Check if a Directory Exists Similarly, with the file.exists() we can work with the dir.exists() command for the directories. For example: ...
while IFS= read -r line; do COMMAND_on $line; done < input.file 这是更适合人类阅读的语法: #!/bin/bash input="/path/to/txt/file" while IFS= read -r var do echo "$var" done < "$input" 示例 下面是一些例子: #!/bin/ksh ...