Tricks and hints

boreo · 06-14-2003, 04:18 AM

I just read the 5 pages!!! This thread rocks!!!!.. P.S I just made a little book about all the tricks for my personal use lol

unSpawn · 06-14-2003, 07:39 AM

Sometimes you come across a file you need several consecutive lines of. Shame the part you want doesn't start at line 1 or doesn't end at the last line. Adding this function to your functionlib or ~/.bashrc

Code:

function getLines() { # Get lines from file
arg=( $@ )
if [ "${#arg[@]}" != "3" -o ! -f "${arg[0]}" ]; then
printf "%sgetLines: <file> <from> <to>\n"; else
str=( $(wc -l ${arg[0]}) ); str="${str[0]}"
arg[1]=$(expr ${str} - ${arg[1]})
arg[2]=$(expr ${str} - ${arg[2]})
echo \$-${arg[1]},\$-${arg[2]} p | ed -s ${arg[0]}
fi; unset str; }

now you can "getLines: <file> <first line> <last line>".
Note the "core" is just a simple "ed" line.

Brain Drop · 06-14-2003, 11:02 PM

what a groovy thread!!

when i read about bash commands it often doesnt sink in but here with the examples some of you gave it made more sense.

like i think i never really paid attention to alias before, seems pretty powerful to me now.

to make sure i got it right: you can type in .bashrc like this:

alias cdnow='cdrecord -v -audio -pad speed=<burning speed> dev=<your device>'

and then when its time type:

cdnow /path/to/*.wav

yes?

Crashed_Again · 06-14-2003, 11:26 PM

yup! pretty cool huh? There is a thread around here somewhere where people posted the different aliases they used. Its pretty cool.

Okay I just went back and read all the pages. Pretty cool stuff. Anyway, I'm sure some of you already know this but I like to use subshells sometimes. If I'm in some crazy directory like /usr/java/j2sdk/plugins/i386/blah/blah and I want to go somewhere else and do something without having to cd back to this directory I can do it in a subshell like this:

[user@localhost ns610]$ pwd
/usr/java/j2sdk1.4.1_02/jre/plugin/i386/ns610
[user@localhost ns610]$ (cd /usr/lib/fakedirctory; ls)
Fake.txt Contents FakeFile.txt
[user@localhost ns610]$ pwd
/usr/java/j2sdk1.4.1_02/jre/plugin/i386/ns610

As you can see, because I enclosed the command in parenthesis it simply kicks me back to the original directory is was in.

Brain Drop · 06-15-2003, 05:08 PM

not really a linux trick but id just like to point out the web browser startpage that somebody else here pointed out awhile ago( i cant remember who) where you use a local file with hyperlinked images of all your commonly visited web page logos. i started doing this myself and it sure makes life simpler. and although its a local file i still use the remote images so i always know if a link no longer works as soon as my browser starts.

fancypiper · 06-16-2003, 04:51 PM

Alt+B -> Go back one word
Alt+F -> Go forth one word
Ctrl+K -> Delete everything from the cursor to the end of the line
Ctrl+U -> Delete everything from the cursor to the beginning of the line
Ctrl+Y -> Paste deleted characters at the current position
Ctrl+H -> Delete one character
Ctrl+L -> Clean screen
Ctrl+P -> Go to the previous history entry
Ctrl+N -> Go to the next history entry

Also you can use !word to re-execute the last command beginning with "word".

Using !word

$ gcc -o test test.c
$ !gcc
gcc -o test test.c
$

fancypiper · 06-21-2003, 12:18 AM

For example, to run hopalong as your background, open an x terminal and command:

Code:

nohup /usr/X11R6/lib/xscreensaver/hopalong -root &

nohup = no hangup, i.e. lets process run after x terminal closes, the & returns the terminal for use with the process in the background.

oneferna · 06-22-2003, 12:33 PM

I ssh everywhere so I like to make aliases for that, I have a million aliases in my .bash_profile

example

alias server1="ssh me@server1.com" (I can't figure out how to make LQ not think that's an email address...it's not tho)

so all I type on the command line is server1 and away I go.

jeremy · 07-03-2003, 02:29 PM

I am trying to gauge the interest in a tips and hints sub-forum. Is this something people would be interested in? Would you post in it?

--jeremy

fancypiper · 07-03-2003, 02:50 PM

Do I remember suggesing this when I first joined?

I would vote aye!

andrewlkho · 07-03-2003, 05:18 PM

hmm....me thinks that a link to this thread in the newbie section might be a good idea. after all, these kind of tricks are exactly what a newbie wants when trying to get to know linux.
just my $0.02
andy

slightcrazed · 07-03-2003, 05:25 PM

I think it would be a great idea. More than just tips and hints, I would like to see something more comprehensive. Almost like a mini linuxquestions HOWTO forum.

slight

tigerflag · 07-03-2003, 09:51 PM

(...jumps up and down, raising both hands to be counted twice)

jeremy · 07-04-2003, 10:35 AM

Quote:

Originally posted by slightcrazed
I think it would be a great idea. More than just tips and hints, I would like to see something more comprehensive. Almost like a mini linuxquestions HOWTO forum.

slight

The LinuxQuestions.org HOWTO section is almost completed.

--jeremy

moses · 07-05-2003, 02:00 AM

I haven't read the whole of this thread, so forgive me if this is redundant:

Code:

splitvt

Run two shells in a split window. One above the other. Very useful for programming. . . (Ctrl-W to switch between the two shells by default, can be changed--read the man page).