Thanks to danesh, learnt something new:
(double exclamation point) refers to the previous command; the command !! alone on an input line reruns the previous command.

@angch taught me this, thank you.

Change custom prompt, PS1.

(Or anything name you want to display)



Optionally, you can add \w for current directory, \h for host name, \u for username, and \$ for dollar sign.


Now looks better right?



To decorate it with color (in terminal), use ANSI escape sequence.

This post has been edited by FlierMate4: Feb 18 2023, 11:36 PM

Before ripgrep and ag (the silver searcher), my go-to file search command was find and grep strung together with xargs:


The find '-print0' and xargs '-0' options go together, according to the man page, but I usually skip it out of laziness

I usually follow up the command with sed like so:

Where old-thing is usually the same search string used in the earlier grep.

Handy when you're ssh'ed into some server that you can't simply install packages.

Anybody has experience using "strace"? Web search says it dump all system calls used in a program.
I seen someone use

Yes? I use it all the time on misbehaving processes. sudo strace -p $pid

It has been brought to my attention that the existence of aria2c https://aria2.github.io/ is not common knowledge.



Use it. How else you're gonna maximize your fancy fibre connections?

I am not Linux expert, only learned it since July 2021.... so I am quite new to Linux command like "grep". Just tried it last month.

Last week or so, I learnt new command dmesg. Can also use in conjunction with grep to filter the unwanted messages.

Example screenshot in Debian 12.8.

I used two lines:

Nice command to read address of entry point of a ELF32/64 binary executable file:



Note the "$4" is the 4th column in the line "Entry point address: 0xXXXXXXXX"

If your Linux distribution doesn't have "readelf", then you can install the "binutils" package.
For example in Debian:

$ dwebp

convert webp to png