In reality you have quite often perform a certain command on several files. First i detect all files I’m looking for and store them in a filelist.

Second i run through this file, line by line and perform my command on all filename I’ve received one step before.

You need to replace in several files. You can do it with sed. Be aware about masking special chars. In the example below the string „my\folder“ is replaced with „your\folder“.
Replacing with sed works like this: sed -i s#old#new#g
The delimiter (in this case the #) can be changed. The first sign after the s acts as delimiter.

 

Getting the size of all files and folders inside the current directory can be done by typing:

Get filesize in descending order from all files in a recursive folder structure

Another quite handy tool is ncdu. It provides you the disc usage in a graphical way on the shell. Install it like this:

List folders bigger 1Mb and list them in descending order

List the ten largest folders inside a recursive folder structure

 

A handy tool for dealing with different bash sessions is tmux. It’s comparable with gnu screen but by far more advanced. You can get it with:

Launch it by typing:

Executing commands tmux specific is usually prefixed with the key combination ctrl+b. See the following list what you can do with tmux.

Dealing with sessions brings great power. You can set up your multi-windows panes on a remote machine, in a seperate session. Now you can detach from this session and log out. When you later ssh back into this machine you can reattach this session and all your views are restored.

 

Want to have a more advanced and easy (intuitive) tool than top, for monitoring, sorting, filtering, killing processes? than htop is the tool of your choice.
Simply install it by using:

and start it with:

Have fun watching your processes.

show all visible characters like spaces, tabs, linebreaks / hide all visible characters

Enable syntax-highlighting / Disable syntax-highlighting

Enabling current row and column highlighting

Enabling relative line numbering (cursor is always at zero)

Indentation in vi

you want to mark something in visual mode, and indent the selected part several times to the left or the right?
First you add these lines to your .vimrc

Now you can visually select a text-passage (press v move the arrow keys), afterwards indent it to the left by pressing < or indent it to the right by pressing >

Shortkeys

 

Find files and file content on the terminal can be achieved by the use of the find tool.

By far one of the best tools is „Silversearcher ag“, install it with sudo apt-get install silversearcher-ag. If you want to search for example recursive all folders, only php files for the search string „my Value“, simply type:

Find file/s containing a specific string in its name:

Now list all files that contain the word „searchTerm“

List all the occurrence and their respective line-number of „searchTerm“ in files. The parameter -n toggles the line-number, the parameter -H toggles the filename.

A handy tool as well is ack-grep (you have to install it first). Be sure to wrap the search-term in single quotes.

 

crontab is a mighty linux tool intendet for executing tasks schedule by predefined timing rules.

List all schedules of current user

List all schedules of specific user

 

You’d like to exchange data – files or folders – from a local machine to a remote one or visa verce?
scp (secure copy) is the tool of choice.

Copy local file to remote folder

Copy local folder to remote folder

Copy remote file to local folder

Copy remote folder to local folder