Linux tips
Dieu a sagement agi en plaçant la naissance avant la mort ; sans cela, que saurait-on de la vie ?
Alphonse Allais
- fortran
c write integer into character
c write character into integer
c loops optimizations
if (n>m)
- f90
findent -ofree < source.f > \${source/.f/.f90}
binstar.e
gprof binstar.e | gprof2dot.py > prof.dat
xdot prof.dat
- advanced batch command
for i in `ls *.ps` ; do mv \$i \${i/ps/eps} ; done
- find
\find . -uid 104 -exec chmod o-r '{}' \;
\find . -name \*.hr.bz2 -exec sh -c "basename {} | sed s/\.hr\.bz2//" \;
\find . \( -name \*.v2 -o -name \*.v2.1 \) | grep -v bz2 | grep -v gz
\find . ! -name '*bz2' -exec bzip2 '{}' \;
- advanced grep
Display all lines matching crz(arg) = | grep crz'(\w*)\s\?=' *.f |
Display any lines starting with a dot and digit | grep '^\.[0-9]' |
Display any lines containing ,d[digit] | grep ,d\[0-9\] *.f |
- a2ps
a2ps --medium=A4 --columns=1 --font-size=7 lover0.tpagb -o lover0.ps
pdftops -level3 b3.pdf - | psbook | psnup -2 -W5.5in -H8.5in | ps2pdf - booklet.pdf
- merge pdf
gs -dBATCH -dNOPAUSE -q -sDEVICE=pdfwrite -sOutputFile=finished.pdf file1.pdf file2.pdf
- configure Apache server
in /etc/apache2/mods-enabled :
ln -s ../mods-available/userdir.conf
ln -s ../mods-available/userdir.load
- svn
ssh -g -L 12345:localhost:12345 user@astro.ulb.ac.be
svn checkout --username user --password xxx svn://localhost:12345/home/user/svn_repos/
svn propset svn:executable ON file.exe
svn propedit svn:log --revprop -r NNNN --editor-cmd vim
svn propset svn:keywords "Date Rev Author" file.f90
- vi settings
in .vim/scripts.vim, add the following lines
:set nowrap
:set noautoindent
- setup eduroam connection
in wpa_supplicant.conf, add the following lines
network={
ssid="eduroam"
key_mgmt=WPA-EAP
group=TKIP
eap=TTLS TLS
identity="YourHomeNetID Login"
password="YourHomeNetID Password"
phase2="auth=MSCHAPV2"
}
may need to get certificate from : GTE Cyber Trust Global Root
- Patch
diff originalfile updatedfile > patchfile.patch
patch originalfile -i patchfile.patch -o updatedfile
Patching multiple files
diff -c originaldirectory/ updateddirectory/ > patchfile.patch
patch -i patchfile.patch
Reversing an applied patch
patch -p0 -R -i patchfile.patch
tutorial
- at - command to schedule actions
at now + 1 minutes < .cmd
- sux - su with DISPLAY export
in /etc/pam.d/su add the following line:
session optional pam_xauth.so
- emacs - tricky replacements
ALT % Ctrl Q ^J new_partern
- sshfs syntax
from host, type: sshfs machine.ulb.ac.be:/home/user/dir ~/dir2
to unmount fusermount -u ~/dir2
- ssh tunnel firefox
ssh -D 9999 -C me@ipaddress.com
Firefox> Edit> Preferences> Advanced tab> Network tab> Settings button.
Select Manual proxy configuration
SOCKS Host: localhost Port: 9999
SOCKS v5
No Proxy for: localhost, 127.0.0.1
- ssh and known_hosts
Simply omit the -f flag to operate on ~/.ssh/known_hosts
#
Add entry for host
ssh-keyscan -H astro.ulb.ac.be > /path/to/known_hosts
#
Scan known hosts
ssh-keygen -f /path/to/known_hosts -H -F astro.ulb.ac.be
#
Count matches for host
ssh-keygen -f /path/to/known_hosts -H -F astro.ulb.ac.be | wc -l
#
Remove entry for host
ssh-keygen -f /path/to/known_hosts -R astro.ulb.ac.be
- keyborad : change repeat rate
xset r rate 300 40
xset r rate 200 60
- deborphan problem
egrep '^Status: |^Package: ' /var/lib/dpkg/status | egrep -B 1 'half-installed|half-configured|unpacked|triggers-awaited|triggers-pending'
deborphan --guess-data | xargs sudo apt-get -y remove --purge
- wps fix
export WPS_NO_KDE_NATIVE_DIALOG=1
- virtualbox patch
cd /usr/src/virtualbox-5.2.0 patch -p1 < linux-4.14-host.patch dpkg-reconfigure virtualbox-dkms modprobe vboxdrv
- sddm
to set the keyboard in the login screen, add the following line to /usr/share/sddm/scripts/Xsetup
setxkbmap "be,us"
oggdec -o recording.wav recording.ogg