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Pushd and popd

Today we want to talk about Pushd and popd, a topic that has gained great relevance in recent years. Pushd and popd is an issue that impacts people of all ages, genders and nationalities, as it has been shown to have a significant effect on different aspects of daily life. Since its appearance, Pushd and popd has generated numerous debates, research and changes in various areas, which leads us to reflect on its importance and impact on today's society. In this article, we will further explore the impact of Pushd and popd and its implications for the future.

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pushd & popd
Original authorBill Joy
DevelopersVarious open-source and commercial developers
Operating systemUnix, Unix-like, DOS, Windows, ReactOS
PlatformCross-platform
TypeCommand
A diagram showing a vertical stack of identically-sized rectangles, representing the stack. An additional rectangle of the same type is shown on the left with an arrow indicating it being added to the stack, marked 'push'. A corresponding rectangle on the right, being removed from the top, is marked 'pop'.
Directory paths stack. Elements are pushed onto and popped from the top.

pushd and popd are shell commands that together allow the user to revert to a previous working directory via the command line. They use a stack data structure for directory paths. pushd pushes the working directory path onto the stack and changes to the specified directory, and popd pops the most recent item from the stack and changes directory to the popped value.[1][2][3][4]

Behavior varies if no argument is passed to pushd. On Unix, the command swaps the top two directories on the stack, which toggles between them. On Windows, the command lists the paths in the stack except for the current one.

The commands are widely available as builtin commands in many shells, such as Bash,[5] Command Prompt, PowerShell, C shell, tcsh, 4DOS, Hamilton C shell, KornShell, and FreeCOM.[6]

The stack of directory paths can be displayed via the dirs Unix command or Get-Location -stack PowerShell command. The working directory is at the top of the stack.

The first Unix shell to provide a directory stack was Bill Joy's C shell.[citation needed] The syntax for pushing and popping directories is essentially the same as that used now.[7][8]

Examples

Unix-like

 $ pushd /etc
/etc /usr/ports
 $ popd
/usr/ports
 $

Command Prompt and ReactOS

C:\Users\root>pushd C:\Users
C:\Users>popd
C:\Users\root>

See also

References

  1. ^ Pushd - change directory/folder - Windows CMD - SS64.com
  2. ^ Popd - Windows CMD - SS64.com
  3. ^ Microsoft TechNet Pushd article
  4. ^ Microsoft TechNet Popd article
  5. ^ Bash Reference Manual: Directory Stack Builtins
  6. ^ "FreeCOM - FreeDOS". Archived from the original on 2021-05-08. Retrieved 2019-07-25.
  7. ^ Chapter 14 – 14.6 The Shells' pushd and popd Commands
  8. ^ man tcsh "TCSH(1)". Archived from the original on 2014-03-10. Retrieved 2014-11-03.

Further reading