Linux

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[2]

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 [3]

file system

• Determine file creating and modification times [4]

stat *

Network Connection

• Blocking a port [5]

sudo ufw deny 80

other ufw usage [6]

• 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 [7]

sudo apt-get install python-pip python-dev build-essential 
sudo pip install --upgrade pip 
sudo pip install --upgrade virtualenv 

• apt-cache: search for the name of library package with keyword

apt-cache search libpcre

• install octave from source

System Configuration

• reset root password

sudo passwd root