A Very Very Basic Linux Cheat Sheet

Click here to download a cheat sheet . It makes sense to save and print this for future reference or check below:

The most used and bare minimum one must know to survive within the command line:

Command	Description
man [command]	Display the help information for the specified command.
cd /directorypath	Change to directory.
cp [options]	source destination Copy files and directories.
ls [options]	List directory contents.
mv [options] source destination	Rename or move file(s) or directories.
mkdir [options]	directory Create a new directory.
locate filename	Search a copy of your filesystem for the specified filename.
pwd	Display the pathname for the current directory.
rm [options] directory	Remove (delete) file(s) and/or directories.
rmdir [options] directory	Delete empty directories.

use the man command to know about any command in detail

Other requently used commands:

Command	Description
cat [filename]	Display file’s contents to the standard output device (usually your monitor).
chmod [options]	mode filename Change a file’s permissions.
chown [options]	filename Change who owns a file.
clear	Clear a command line screen/window for a fresh start.
date [options]	Display or set the system date and time.
df [options]	Display used and available disk space.
du [options]	Show how much space each file takes up.
file [options] filename	Determine what type of data is within a file.
find [pathname] [expression]	Search for files matching a provided pattern.
grep [options] pattern [filesname]	Search files or output for a particular pattern.
kill [options] pid	Stop a process. If the process refuses to stop, use kill -9 pid.
less [options] [filename]	View the contents of a file one page at a time.
ln [options] source [destination]	Create a shortcut.
lpr [options]	Send a print job.
passwd [name [password]]	Change the password or allow (for the system administrator) to change any password.
ps [options]	Display a snapshot of the currently running processes.
ssh [options] user@machine	Remotely log in to another Linux machine, over the network. Leave an ssh session by typing exit.
su [options] [user [arguments]]	Switch to another user account.
tail [options] [filename]	Display the last n lines of a file (the default is 10).
tar [options] filename	Store and extract files from a tarfile (.tar) or tarball (.tar.gz or .tgz).
top	Displays the resources being used on your system. Press q to exit.
touch filename	Create an empty file with the specified name.
who [options]	Display who is logged on.

git it, git it good

Get a copy of the repository

Open Terminal.
Change the current working directory to the location where you want the cloned directory to be made.
Type git clone, and then paste the URL you copied in Step 2.

git clone https://github.com/YOUR-USERNAME/YOUR-REPOSITORY

Press Enter. Your local clone will be created.

git clone https://github.com/YOUR-USERNAME/YOUR-REPOSITORY
> Cloning into `Spoon-Knife`...
> remote: Counting objects: 10, done.
> remote: Compressing objects: 100% (8/8), done.
> remove: Total 10 (delta 1), reused 10 (delta 1)
> Unpacking objects: 100% (10/10), done.

Get updated changes from git

Open Terminal.
Change the current working directory to the location of your directory.

git pull

Some unspoken rules

Any files in the repository that you change should be copied to another location before making any changes

Oh no I tried to pull but it is angry, i may have ignored the rule

Updating d0ebfc5..0b10e81
error: Your local changes to the following files would be overwritten by merge:
	examples/spectrometer_w_cal.grc
Please commit your changes or stash them before you merge.
Aborting

Your changes on a file are spotted by the git software and it wants you to save your checkpoint or commit it or stash it away to forget about it
ideally you want to commit changes but if you are not authorised to push commits and you just want to get the updates software you stash it away.
In terminal type:

git stash

If you have not used git before it wanted to documnet you as the changer on the ledger you shoud get this:

*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: unable to auto-detect email address (got 'human@howard-ThinkPad-L390-Yoga.(none)')
Cannot save the current index state

Run this:

git config --global user.email "you@example.com"
git config --global user.name "Your Name"

Substitute your name and email
Run git stast again
Run git pull again

Updating GNURadio software

Open Terminal.
Change the current working directory to the location of the software you want to update

cd gr-radio_astro
git pull
cd build
cmake ..
make
sudo make install

Digital Signal Processing in Radio Astronomy

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