Tips: Unix Commands

Let's share UNIX commands. To start off, here are some. function - create a function - Syntax: function myfunction() { echo - print - syntax: echo hello -Hannah

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You're talking about writing a BASH script, right ?
Because "UNIX commands" is a very vague description which I interpret as commands to start an application (eg "ping 127.0.0.1").

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and also, please, when you give such an info, give it completely.
I'm pretty sure the heading "{" needs a trailing "}" in order the function description to be complete.

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Now that we're talking about mistakes. Usualy a string is places between " " , unless hello is a previously defined variable.
So it should probably be

or


But it all depends on which language/environment you're using

 

 

 

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In Unix I have observed the following two statements give the same results:


Both the methods will process the variable and prints which shell is running.

To take the input as text, whether or not there are variables included, it would be included in single quotes

The output would be $SHELL

Here are some more commands which are commonly used:
tput clear
# Clears screen

ls -l > list
#Saves the list of files and directories in the current directory with attributes (-l) in "list" file.

cat filename
# Display file contents

wc list
# Counts number of lines. x lines, x words, x characters

Anything starting with hypen (-) is an option. It needs to be separate, that is no characters after or before it.

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Talking about tput, another interesting one is

This resets your terminal to standard values, removing "rev", "blink" and other disagreeable features you got if you "cat" a binary file to your display.

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Yes, Yes, Yes and Yes.
Now I'm actully learning something!

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