Difference between revisions of "Linux"
From ACL@NCU
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* Extract a substring [http://www.starlink.rl.ac.uk/docs/sc4.htx/node38.html] | * Extract a substring [http://www.starlink.rl.ac.uk/docs/sc4.htx/node38.html] | ||
* Split a string | |||
The awk function split(,,sep) splits a string into an awk array using the delimiter sep. | |||
<pre> | |||
set time = 12:34:56 | |||
set hr = `echo $time | awk '{split($0,a,":"); print a[1]}'` # = 12 | |||
set sec = `echo $time | awk '{split($0,a,":"); print a[3]}'` # = 56 | |||
</pre> | |||
* Translation between bash and tcsh [http://joelinoff.com/blog/?page_id=235] | * Translation between bash and tcsh [http://joelinoff.com/blog/?page_id=235] | ||
Revision as of 01:17, 5 May 2013
Useful tcsh and python commands
tcsh
- Find files
with defined stem pattern under multiple different folder
find */*/*anat+tlrc.*
- find files with a suffix recursively under subdirectories
find . -name \*.mgz -print
- delete or copy filenames from a "pattern" search
rm `find */*/*anat+tlrc.*`
- comment multiple lines
:<<LABEL comment line #1 comment line #2 comment line #3 ... comment line #final LABEL
- Extract a substring [1]
- Split a string
The awk function split(,,sep) splits a string into an awk array using the delimiter sep.
set time = 12:34:56
set hr = `echo $time | awk '{split($0,a,":"); print a[1]}'` # = 12
set sec = `echo $time | awk '{split($0,a,":"); print a[3]}'` # = 56
- Translation between bash and tcsh [2]
file system
- Determine file creating and modification times [3]
stat *
Network Connection
- Blocking a port [4]
sudo ufw deny 80
other ufw usage [5]
- Scanning available ports
nmap -PS <IP address>
- Scanning all available IPs in subnet
nmap -sP 192.168.1.0/24
- restart network GUI (allow the top-left icon of network to show up)
sudo service network-manager restart
Install new packages
- pip [6]
sudo apt-get install python-pip python-dev build-essential sudo pip install --upgrade pip sudo pip install --upgrade virtualenv