Back to Commands

exec

file managementLinux/Unix
The exec command is one of the most frequently used commands in Linux/Unix-like operating systems. exec Sample fallback description for exec
See ExamplesView Syntax

Quick Reference

Command Name:

exec

Category:

file management

Platform:

Linux/Unix

Basic Usage:

exec [options] [arguments]

Common Use Cases

  • 1

    Process replacement

    Replace the current shell with another program without creating a new process

  • 2

    Resource conservation

    Avoid creating nested processes in scripts

  • 3

    File descriptor manipulation

    Permanently redirect I/O for the remainder of a script

  • 4

    Shell script chaining

    Transfer control from one script to another without returning

Syntax

exec [OPTION]... [FILE]...

Options

Option Description
-l Use a long listing format
-a Show hidden entries starting with .
-h Human-readable sizes
-R List subdirectories recursively

Examples

How to Use These Examples

The examples below show common ways to use the exec command. Try them in your terminal to see the results. You can copy any example by clicking on the code block.

Basic Examples:

ls
List files in the current directory.
ls -l
List files in long format with details.
ls -a
List all files including hidden ones.

Advanced Examples:

ls -lah Detailed list with human-readable sizes. ls -R List directories recursively.

Try It Yourself

Practice makes perfect! The best way to learn is by trying these examples on your own system with real files.

Understanding Syntax

Pay attention to the syntax coloring: commands, options, and file paths are highlighted differently.

Notes

These are sample notes for the exec command.

Tips & Tricks

1

When using exec with a command, remember that control will not return to the calling shell

2

Use exec for file descriptor operations like exec 3> file.txt to open a file for writing

3

Use exec 2>&1 to redirect stderr to stdout for the remainder of a script

4

Combine with redirection to permanently change I/O for the current shell: exec > logfile.txt

5

Use exec -a name command to set a custom process name

Common Use Cases

Process replacement

Replace the current shell with another program without creating a new process

Resource conservation

Avoid creating nested processes in scripts

File descriptor manipulation

Permanently redirect I/O for the remainder of a script

Shell script chaining

Transfer control from one script to another without returning

Daemon startup

Launch daemon processes with specific environment configurations

Related Commands

These commands are frequently used alongside exec or serve similar purposes:

bash
sh
source
eval
command
fork
exit
wait
Explore All Commands

Use Cases

1

Process replacement

Replace the current shell with another program without creating a new process

2

Resource conservation

Avoid creating nested processes in scripts

3

File descriptor manipulation

Permanently redirect I/O for the remainder of a script

4

Shell script chaining

Transfer control from one script to another without returning

5

Daemon startup

Launch daemon processes with specific environment configurations

Learn By Doing

The best way to learn Linux commands is by practicing. Try out these examples in your terminal to build muscle memory and understand how the exec command works in different scenarios.

See ExamplesTry Lab Exercises
$ exec
View All Commands
exec - Linux Command Guide | LinuxConcept