How do you check if a file is present in a directory in shell script?

How do you check if a file is present in a directory in shell script?

In order to check if a directory exists in Bash using shorter forms, specify the “-d” option in brackets and append the command that you want to run if it succeeds. [[ -d ]] && echo “This directory exists!” [ -d ] && echo “This directory exists!”

How do you check if a files exists in bash?

Let’s understand it with examples:

  1. test [ Expression ] Copy the given script and paste it into the editor, save it: #!/bin/bash. filename=file1. if test -f “$filename”;
  2. if [ Expression ] Copy the following script to check the if file exists or not: #!/bin/bash. filename=myfile.txt.
  3. if [[ Expression ]]

How check file is empty or not in shell script?

Check If File Is Empty Or Not Using Shell Script

  1. touch /tmp/file1 ls -l /tmp/file1 find /tmp -empty -name file1.
  2. echo “data” > /tmp/file2 ls -l /tmp/file2 find /tmp -empty -name file2.
  3. touch /tmp/f1 echo “data” >/tmp/f2 ls -l /tmp/f{1,2} [ -s /tmp/f1 ] echo $?
  4. [ -s /tmp/f2 ] echo $?

How do you check if a directory exists in a bash shell script?

Checking If a Directory Exists In a Bash Shell Script -h “/path/to/dir” ] && echo “Directory /path/to/dir exists.” || echo “Error: Directory /path/to/dir exists but point to $(readlink -f /path/to/dir).” The cmd2 is executed if, and only if, cmd1 returns a non-zero exit status.

How do you search for a file in Unix?

You need to use the find command on a Linux or Unix-like system to search through directories for files….Syntax

  1. -name file-name – Search for given file-name.
  2. -iname file-name – Like -name, but the match is case insensitive.
  3. -user userName – The file’s owner is userName.

How do you check if a file is a directory in Unix?

  1. One can check if a directory exists in a Linux shell script using the following syntax: [ -d “/path/dir/” ] && echo “Directory /path/dir/ exists.”
  2. You can use ! to check if a directory does not exists on Unix: [ ! -d “/dir1/” ] && echo “Directory /dir1/ DOES NOT exists.”

How do you check if a user exists in Linux?

user infomation is stored in /etc/passwd, so you can use “grep ‘usename’ /etc/passwd” to check if the username exist. meanwhile you can use “id” shell command, it will print the user id and group id, if the user does not exist, it will print “no such user” message.

How do you check if a directory does not exists in bash?

Bash Program to Check if A Directory Exists

  1. Check if a directory exists: Shell. if [ -d “$DIR” ]; then # Script statements if $DIR exists. fi. if [ -d “$DIR” ]; then. # Script statements if $DIR exists.
  2. Check if a directory doesn’t exist: Shell. if [ ! – d “$DIR” ]; then # script statements if $DIR doesn’t exist. fi.

How do you check if a file exists and not empty in Unix?

Please note, that [ -f “$file” ] && [ -s “$file” ] will return true if file exists and is not empty….which, in addition to the regular files dictated by the word -f , also looks for:

  1. Directory.
  2. Symbolic Link.
  3. Block Special Device.
  4. Character Device.
  5. Unix Socket (local domain socket)
  6. Named Pipe.

How do I know my current shell?

Use the following Linux or Unix commands:

  1. ps -p $$ – Display your current shell name reliably.
  2. echo “$SHELL” – Print the shell for the current user but not necessarily the shell that is running at the movement.

How to check if a shell script is running?

ps -p$$– Display your current shell name reliably.

  • echo “$SHELL” – Print the shell for the current user but not necessarily the shell that is running at the movement.
  • echo$0 – Another reliable and simple method to get the current shell interpreter name on Linux or Unix-like systems.

    • How do you create a shell script?

    Use a text editor such as vi.

  • Save and close the file (exit from vi).
  • Make the script executable.
  • You should then of course test the script,and once satisfied with the output,move it to the production environment.

    • How to execute an encrypted shell script?

    Encrypt Password Using Openssl. Let’s assume we want to connect to remote system over ssh using password inside a shell script.

  • Decrypt Encrypted Password Using Openssl. Note: If you have noticed carefully,we have used ‘-d’ option to decrypt.
  • Use Encrypted Password in Bash Shell Script.

    • How to delete a file if it exists?

    – A file don’t exists at given path. Error message will be like, [WinError 2] The system cannot find the file specified FileNotFoundError: [Errno 2] No such file or directory – User doesn’t have access to it file at given path. Error message will be like, [WinError 5] Access is denied – Given path is a directory.