Linux/Parsing

lines

• grep

grep -v ^$        # remove empty lines

• tail

tail 
tail -f                # follow
tail -n 10             # last 10 lines
tail +3                # skip first 3 lines 

• wc

wc -l                  # count lines 

chars

• cut

  uname -a 
  -> Linux nutzer-laptop 3.2.0-030200-generic #201201042035 SMP Thu Jan 5 01:36:31 UTC 2012 x86_64 x86_64 x86_64 GNU/Linux
  
  uname -a | cut -d" " -f1,3,12 
  -> Linux 3.2.0-030200-generic x86_64
  

• tr

• parameter expansion

directories and files

• basename

sed & awk

• sed + control characters

sed 's/\x00/controlcharwashere/g'

sed -n '/Iowa/,/Montana/p'

other

• slowing output

cat incoming.log | pv -qL 1000 | tee temp

• show as hex

od -t x1 -An

Links

• http://www.unix.com/tips-tutorials/18009-12-ways-parse-file.html
• http://sed.sourceforge.net/sed1line.txt
• http://www.grymoire.com/Unix/Sed.html