colorful man pages
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
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.
xterm colors
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
pdfnup: print 2 pages in 1 sheet
When I want to print 2 pages in 1 sheet, the contents of the pages become too small: inside the margin of the sheet, the 2 pages keep their margins too.
There is a nice tool called pdfnup (part of pdfjam), which not only help us get rid of the margin problem, but we can trim, shift and do whatever we want with a pdf document to create a more readable new one.
When I print books, most of the time this line is enogh:
pdfnup --nup 2x1 --paper a4paper --noautoscale true --outfile output.pdf input.pdf
There was only one case when some fine calibration was needed:
pdfnup --nup 2x1 --paper a4paper --trim '4.5cm 3.5cm 4.5cm 3.5cm' --outfile output.pdf input.pdf
vim delete lines with regexp, replace string
uzbl is an awesame ultralightweight browser, however gmail has cookie issues. The only way I found to have a working uzbl+gmail is to remove every line from .local/share/uzbl/cookies.txt which contain Google/google when the cookie problem happens.
With vim it's possible to look for STRING case insensitively and delete lines:
:g/\cSTRING/d
Also replace STRING1 to STRING2 in one line or in all lines.
:s/STRING1/STRING2/g :%s/STRING1/STRING2/g
gcc, colorgcc, lcov, valgrind
At home I usually don't create makefiles when my program is so small that it fits into one file.
However compilation errors are more readable with colorgcc, and having as much warnings/errors at compilation time as possible is even better.
.bashrc:
GCC_ARGS="-Wall -Werror -pedantic -Weffc++ -Wshadow -ggdb --coverage" alias g++="/usr/lib/colorgcc/bin/g++ $GCC_ARGS" alias gcc="/usr/lib/colorgcc/bin/gcc $GCC_ARGS"
The -ggdb puts debug symbols to the binary and --coverage will make the binary create .gcda and .gcno files at runtime.
To create a nice coverage-html lcov needs more steps (3) than I'm willing to type everytime so the following line in the .bashrc do the work. Note that the lcov_all is function, because argument passing is not possible with aliases.
alias lcov_reset="lcov --directory . -z ; rm -f ./lcov.info"
alias lcov_capture="lcov --directory . --capture -o lcov.info"
alias lcov_html="rm -rf ./cov ; mkdir cov ; genhtml -o ./cov lcov.info"
function lcov_all() { lcov_reset ; $1 ; lcov_capture ; lcov_html ; }
The best way to alter valgrind's behavior modifying the .valgrindrc:
--leak-check=full --show-reachable=yes --malloc-fill=0xaa --free-fill=0xbb
So when I program follow the following steps:
- Edit the source.
g++ <sourcefile>- run
<binary> - Check leaks:
valgrind <binary> - If coverage is needed,
lcov_all <binary>
create password with openssl
So trivial, yet it was unknown for me for such a long time long:
openssl rand -base64 12
cncji0R8KIr9G40q
kboFCpbT81hOQSQK
dgdr7rart8koI7Bd
...
command line GTD – task
A todo app is always handy, when you want to keep your shit together.
If you are not familiar with Getting Things Done from David Allen, do some googling & torrents reading, it worths the effort.
After trying ikog I settled with task, which is much richer in features (import/export vcalendars, etc)
I added the following lines to my .taskrc, which set some params and define a new view called l1.
defaultwidth=100 editor=vim report.l1.columns=id,project,priority,due,tags,description report.l1.filter=status:pending report.l1.labels=ID,Project,Pri,Due,Tags,Description report.l1.sort=due+,priority-,project+
So when I append the line to my .bashrc:
task l1
Every time I open a new terminal, I got reminded to my tasks.
put/get files to/from ftp server non-interactively
I decided to sync my work/home computers' calendar/contact files.
Since I wanted to avoid gmail and other closed solutions, I chose ftp as a transfer method and after some search I found ncftp which does the job.
Now I can issue the get script after login and the put before logout at each machine.
#!/bin/bash # get files from remote server ncftpget -u USER -p PASS FTPSERVER /LOCALPATH/ std.ics ncftpget -u USER -p PASS FTPSERVER /LOCALPATH/ std.vcf
#!/bin/bash # upload files to remote server ncftpput -u USER -p PASS FTPSERVER . /LOCALPATH/std.ics ncftpput -u USER -p PASS FTPSERVER . /LOCALPATH/std.vcf