Bash on despatches

How to fix terminal title after disconnecting from ssh

Thu, 25 Jun 2020 08:47:45 +0000

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.

```bash 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

```bash 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

```bash echo -ne '\e[23t' ```

Looping from the bash commandline [1113]

Tue, 20 Dec 2011 13:32:08 +0000

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.

Linux bulk search and replace

Wed, 21 Apr 2010 13:47:26 +0000

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.

```bash $ 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)

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

or find

```bash $ 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

```sed 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.

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

et voila - hope it helps.