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Here are a few Linux commands I often forget, but find very useful

1. Disown

So you started something running on a machine but then realize that you want to go home, that means you should have started it prefixed with nohup, so when close your terminal window the application still keeps running. However once you’ve started an application, you can use “ctrl+z”   “bg” and then “disown”

chris@mango:~> sleep 1000
^Z
[1]+  Stopped                 sleep 1000
chris@mango:~> bg
[1]+ sleep 1000 &
chris@mango:~> disown
chris@mango:~>

Now you can close the terminal down, if we open up another terminal and look at the running jobs

chris@mango:~> ps -e | grep sleep
16334 pts/0    00:00:00 sleep
chris@mango:~>

you can see it’s still running.

2. Search and Replace in multiple files

There are many ways to do this, here is a way using sed
This replaces hello with goodbye in all php files recursively.
If your need to use a # symbol in the search/replace code just replace all 3 hashes with some other character (such as colon:  pipe| or forward slash/ )

find . -type f -name “*.php” -exec sed -i “s#${search}#${replace}#g” {} \;

3. What do I need to speed up

Not always obvious, but “What commands do I use a lot, so I can look at write scripts or aliases to speed them up?”

history |tr '\011' ' ' |tr -s " "| cut -d' ' -f3 |sort |uniq -c |sort -nbr |head -n10

This will extract from your history your top 10 most used commands.
Increase your history length by adding

HISTSIZE=10000 #or whatever length you need

to ~/.bashrc

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