Change the current directory from a Bash script

问题

Is it possible to change current directory from a script?

I want to create a utility for directory navigation in Bash. I have created a test script that looks like the following:

#!/bin/bash
cd /home/artemb

When I execute the script from the Bash shell the current directory doesn't change. Is it possible at all to change the current shell directory from a script?

回答1:

You need to convert your script to a shell function:

#!/bin/bash
#
# this script should not be run directly,
# instead you need to source it from your .bashrc,
# by adding this line:
#   . ~/bin/myprog.sh
#

function myprog() {
  A=$1
  B=$2
  echo "aaa ${A} bbb ${B} ccc"
  cd /proc
}

The reason is that each process has its own current directory, and when you execute a program from the shell it is run in a new process. The standard "cd", "pushd" and "popd" are builtin to the shell interpreter so that they affect the shell process.

By making your program a shell function, you are adding your own in-process command and then any directory change gets reflected in the shell process.

回答2:

When you start your script, a new process is created that only inherits your environment. When it ends, it ends. Your current environment stays as it is.

Instead, you can start your script like this:

. myscript.sh

The . will evaluate the script in the current environment, so it might be altered

回答3:

In light of the unreadability and overcomplication of answers, i believe this is what the requestor should do

add that script to the PATH
run the script as . scriptname

The . (dot) will make sure the script is not run in a child shell.

回答4:

Putting the above together, you can make an alias

alias your_cmd=". your_cmd"

if you don't want to write the leading "." each time you want to source your script to the shell environment, or if you simply don't want to remember that must be done for the script to work correctly.

回答5:

If you are using bash you can try alias:

into the .bashrc file add this line:

alias p='cd /home/serdar/my_new_folder/path/'

when you write "p" on the command line, it will change the directory.

回答6:

If you run a bash script then it will operates on its current environment or on those of its children, never on the parent.

If goal is to run your command : goto.sh /home/test Then work interactively in /home/test one way is to run a bash interactive subshell within your script :

#!/bin/bash
cd $1
exec bash

This way you will be in /home/test until you exit ( exit or Ctrl+C ) of this shell.

回答7:

With pushd the current directory is pushed on the directory stack and it is changed to the given directory, popd get the directory on top of the stack and changes then to it.

pushd ../new/dir > /dev/null
# do something in ../new/dir
popd > /dev/null

回答8:

Simply go to

yourusername/.bashrc (or yourusername/.bash_profile on MAC) by an editor

and add this code next to the last line:

alias yourcommand="cd /the_path_you_wish"

Then quit editor.

Then type:

source ~/.bashrc or source ~/.bash_profile on MAC.

now you can use: yourcommand in terminal

回答9:

I've made a script to change directory. take a look: https://github.com/ygpark/dj

回答10:

Basically we use cd.. to come back from every directory. I thought to make it more easy by giving the number of directories with which you need to come back at a time. You can implement this using a separate script file using the alias command . For example:

code.sh

#!/bin/sh
 _backfunc(){
 if [ "$1" -eq 1 ]; then
  cd ..
 elif [ "$1" -eq 2 ]; then
  cd ../..
 elif [ "$1" -eq 3 ]; then
  cd ../../..
 elif [ "$1" -eq 4 ]; then
  cd ../../../..
 elif ["$1" -eq 10]; then
  cd /home/arun/Documents/work
 fi
 }
alias back='_backfunc'

After using source code.sh in the current shell you can use :

$back 2

to come two steps back from the current directory. Explained in detail over here. It is also explained over there how to put the code in ~/.bashrc so that every new shell opened will automatically have this new alias command. You can add new command to go to specific directories by modifying the code by adding more if conditions and different arguments. You can also pull the code from git over here.

回答11:

This approach is easier for me.

Suppose on a personal iMac where you are an admin, under the default directory when a command window is opened, /Users/jdoe, this will be the directory to go to: /Users/jdoe/Desktop/Mongo/db.3.2.1/bin.

These are the steps that can have the job done:

vi mongobin, in which I entered: cd /Users/jdoe/Desktop/Mongo/db.3.2.1/bin as the first line.
chmod 755 mongobin
source mongobin
pwd

Voila!

回答12:

I've also created a utility called goat that you can use for easier navigation.

You can view the source code on GitHub.

As of v2.3.1 the usage overview looks like this:

# Create a link (h4xdir) to a directory:
goat h4xdir ~/Documents/dev

# Follow a link to change a directory:
cd h4xdir

# Follow a link (and don't stop there!):
cd h4xdir/awesome-project

# Go up the filesystem tree with '...' (same as `cd ../../`):
cd ...

# List all your links:
goat list

# Delete a link (or more):
goat delete h4xdir lojban

# Delete all the links which point to directories with the given prefix:
goat deleteprefix $HOME/Documents

# Delete all saved links:
goat nuke

# Delete broken links:
goat fix

回答13:

I like to do the same thing for different projects without firing up a new shell.

In your case:

cd /home/artemb

Save the_script as:

echo cd /home/artemb

Then fire it up with:

\`./the_script\`

Then you get to the directory using the same shell.

回答14:

Add below cd line in your shellscript this:

exec $SHELL

回答15:

Declare your path:

PATH='/home/artemb'     
cd ${PATH}

来源：https://stackoverflow.com/questions/874452/change-the-current-directory-from-a-bash-script

标签

bash

environment