Tag Archives: bash

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June 25, 2020

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How to fix terminal title after disconnecting from ssh

For some reason, ssh does not clean up after itself in terms of updating the terminal title when you disconnect.

Here is a simple solution, a combination of https://unix.stackexchange.com/a/341277/25975 and https://unix.stackexchange.com/a/28520/25975

Add the following functions into your ~/.bashrc It will push the current title and icon into a stack and pop it afterwards.

function ssh()
{
    # push current title and icon to stack
    echo -ne '\e[22t'
    # Execute ssh as expected
    /usr/bin/ssh "$@"
    # revert the window title after the ssh command
    echo -ne '\e[23t'
}

Restart bash / log out and back in, and it should work.

For security reasons, it is not possible to query the current title of the terminal. However, with the following command, you can push the current one on to a stack

echo -ne '\e[22t'

The title can then be set to anything, by ssh for example. You can then pop that back from the stack using

echo -ne '\e[23t'
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December 20, 2011

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Looping from the bash commandline [1113]

I figured this out the other day from idle curiosity. There is occassionally the need to have a never ending loop to be executed directly from the bash commandline instead of writing a script.

I used this to run sl (yes sl, not ls – try it – I love it) repeatedly.

$ while true; do ; done

for example

$ while true; do sl; done

Bear in mind that this loop is infinite and there is no way to cancel out of it except to kill of the terminal.

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April 21, 2010

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Linux bulk search and replace

Doing a bulk search and replace across a set of files is actually surprisingly easy. sed is the key. It has a flag – i that will modify the files passed to it in-place.

$ sed -e 's/TextToFind/Replacement/' -i file1 file2 file3

Tie this power with either grep -l . [Thanks to Steve for pointing out a mistake in the following, now corrected]

$ grep -l TextToFind * |xargs sed -e 's/TextToFind/Replacement/' -i

or find

$ find . -exec sed -e 's/TextToFind/Replacement' -i {} ;

If there are multiple changes you want to make, just put them all into a file and pass it in via the -f flag.

file: replacements.patterns

s/TextToFind1/Replacement1/
s/TextToFind2/Replacement2/
s/TextToFind3/Replacement3/

and the command, using find to iterate through all files in the current directory and subdirectories.

find . -exec sed -f replacements.patterns -i {} ;

et voila – hope it helps.