selfjungle

bash case-insensitive filename tab-competion

admin — Tue, 06 Dec 2011 19:57:31 +0000

Edit /etc/inputrc:

add this line:

set completion-ignore-case on

shortcuts to find and grep

admin — Mon, 05 Dec 2011 19:08:32 +0000

Writing these 2 line way too much a day.

Edit ~.bashrc:

function gr {
grep -Hrni $1 *
}

function f {
find . -iname *$1* | grep -i $1
}

colorful man pages

admin — Fri, 18 Nov 2011 13:29:16 +0000

Edit ~./Xdefaults:

*VT100*colorULMode: on
*VT100*colorUL: yellow
!*VT100*italicULMode: on
*VT100*underLine: off
! Uncomment this to use color for the bold attribute
*VT100*colorBDMode: on
*VT100*colorBD: cyan

merge two pdf documents

admin — Tue, 18 Oct 2011 15:02:08 +0000

I had to sign a document, which was basically:

Print the last, 5th page of the pdf.
Sign the sheet.
Scan it as a one-paged pdf.
Change the 5th page from the pdf with the new one.

Again, the solution was pdfjam, which did the job of merging the first 4 page of the original document with the new pdf.

pdfjam original.pdf '1-4'  new.pdf '-' --outfile merged.pdf

I found nice pdfjam examples at the The Bit Brothers.

perl regexp – threat whole string as one line

admin — Tue, 19 Jul 2011 15:34:32 +0000

s - Treat the whole string as one line, so that even /./ will match a "newline" character.

#!/usr/bin/perl

my $multiline =
  "In the town where I was born,\n" .
  "Lived a man who sailed to sea,\n" .
  "And he told us of his life,\n" .
  "In the land of submarines.";

if ($multiline =~ /born,.Lived/s) {
  print "found\n";   # found in deed
} else {
  print "not found\n";
}

xterm colors

admin — Tue, 19 Jul 2011 14:57:58 +0000

The blue is too dark for my eyes, specially then it's used by colorgcc to highlight line numbers.

...and I just can't get angry with a cheerful orange cursorColor

~./Xdefaults:

xterm*foreground:       #ffffff
xterm*background:       #000000
xterm*cursorColor:      orange
xterm*color4:           #526fcf

find and remove files

admin — Tue, 19 Jul 2011 12:41:49 +0000

With rm and find:

rm $(find . -name *.gcda)

Or with the -exec paramter of find

find . -name *.gcda -exec rm -rf {} \;

git tag

admin — Mon, 18 Jul 2011 08:37:05 +0000

Tag commit:

git tag -m

Push tags (not done by default):

git push --tags

Fetch tags:

git fetch --tags

git remote update

choose default answers at make oldconfig

admin — Mon, 18 Jul 2011 08:23:24 +0000

Linux command yes outputs parameter string.

yes "" | make oldconfig

Stringizing Operator, Token concatenation

admin — Sat, 19 Mar 2011 11:36:42 +0000

After many years, even C shows new stuff:

Stringizing Operator

#define QUOTEME(x) #x

According to wiki:

Although macro expansion does not occur within a quoted string, the text of the macro arguments can be quoted and treated as a string literal by using the "#" directive (also known as the "Stringizing Operator").

the code

printf("%s\n", QUOTEME(1+2));

will expand to

printf("%s\n", "1+2");

Token concatenation

Token concatenation, also called token pasting, is one of the most subtle — and easy to abuse — features of the C macro preprocessor. Two arguments can be 'glued' together using ## preprocessor operator; this allows two tokens to be concatenated in the preprocessed code. This can be used to construct elaborate macros which act like a crude version of C++ templates.

For instance:

#define MYCASE(item,id) \
case id: \
  item##_##id = id;\
break

the code

MYCASE(widget,23);

will expand to

widget_23 = 23;