Linux/Parsing: Difference between revisions

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== lines ==
== lines ==
* grep
* grep
<blockquote>
<pre>
grep -v ^$        # remove empty lines
</pre>
</blockquote>
* tail
* tail
<blockquote>
<blockquote>
Line 6: Line 12:
tail  
tail  
tail -f                # follow
tail -f                # follow
tail -n 10            # last 10 lines  
tail -n 10            # last 10 lines
tail +3                # skip first 3 lines  
</pre>
</pre>
</blockquote>
</blockquote>
*  
* wc
<blockquote>
<pre>
wc -l                  # count lines
</pre>
</blockquote>
 
== chars ==
* cut<syntaxhighlight lang="bash">
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
</syntaxhighlight>
* tr
 
* parameter expansion
<syntaxhighlight lang="bash">
</syntaxhighlight>
 
== directories and files ==
* basename


== sed & awk ==
== sed & awk ==
Line 44: Line 73:




* Links
== Links ==
** http://www.unix.com/tips-tutorials/18009-12-ways-parse-file.html
* http://www.unix.com/tips-tutorials/18009-12-ways-parse-file.html
** http://sed.sourceforge.net/sed1line.txt
* http://sed.sourceforge.net/sed1line.txt
** http://www.grymoire.com/Unix/Sed.html
* http://www.grymoire.com/Unix/Sed.html
[[Category:Linux/Bash]]
[[Category:Linux/Bash]]
[[Category:Linux]]
[[Category:Linux]]

Latest revision as of 16:24, 24 November 2020

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