January 3rd, 2010 mysurface
Sometimes, you may have many logs to trace at once, you may need to copy and paste text from files to files, and tabbed terminal is just not convenient enough.
So, you hope for a terminal that allows you to split your console screen into either horizontal or vertical flexibly. If you have such requirements like [...]
Posted in Misc, terminator | Hits: 38083 | No Comments »
November 15th, 2008 mysurface
I remember I wrote a post regarding how to makes python processing string from the pipeline stream. This time, I find the needs to do it in bash script.
I created a hex string splitter script for my friend who needs to decode the raw data that will be written in hex string such as “5F443D95FEA3D4787AEDC4″. [...]
Posted in Bash, pipeline | Hits: 107273 | 3 Comments »
December 6th, 2007 mysurface
To redirect standard output to a file is easy, you just need to use the redirection symbol, for example:
echo “hello world” > test.txt
But what if I want to display it out as well as store into a file?
Answer: tee
echo “hello world” | tee test.txt
Okay it seems very easy, how about append?
Related PostsDisplay & log command [...]
Posted in Text Manipulation, pipeline, python, tee | Hits: 67375 | 12 Comments »
November 20th, 2007 mysurface
grep supposedly support perl regex by specified -P option, but somehow my grep do not support that, it complains this when I trigger with -P
grep: The -P option is not supported
But when you check the manpage of grep, you will see this
-P, –perl-regexp
[...]
Posted in Regular Expression, Text Manipulation, pcregrep, printf | Hits: 36519 | No Comments »
June 19th, 2007 mysurface
This post is to illustrate additional usage of curly brackets { } for range of numbers, continues from smart grouping shorten long command line.
Let say you have a list of logs where you want to pick a range of logs for analysis, the sample log files shows as bellow
tcp_06062007_1.txt
…
tcp_06062007_180.txt
tcp_06062007_181.txt
tcp_06062007_182.txt
…
tcp_06062007_230.txt
In order to archive logs from range [...]
Posted in Symbol, curly brackets, tar | Hits: 30715 | No Comments »
May 4th, 2007 mysurface
Ubuntu, a Linux distribution that is getting popular because it has successfully improves it’s user friendliness with simple User interface. You can install any applications with few clicks, configuration under GUI dialogs etc. People usually have the thinking of maybe one day, Ubuntu will become another new operating system like Microsoft Windows.
Never! The concept of [...]
Posted in Bash, apt-cache, apt-get, complete, pipeline, sort, svn | Hits: 48428 | 5 Comments »
November 8th, 2006 toydi
Since tee can read the standard input, and write to multiple files, we may leverage this feature so that it writes to multiple processes (instead of files).
tee >(process1) >(process2) >(process3) | process4
>( ) (see process substitution) pretends itself as a write-only file. Everything you write into it, will be passed to the command (as standard [...]
Posted in Common, grep, process substitution, tee | Hits: 46996 | 28 Comments »
November 8th, 2006 toydi
Given two directories: ~/dir-new/ and ~/dir/,
$ ls ~/dir-new/
file-01.txt
file-02.txt
file-new.txt
$ ls ~/dir/
file-01.txt
file-02.txt
file-old.txt
To compare them:
comm
Posted in Text Manipulation, comm, process substitution | Hits: 41734 | 2 Comments »
November 5th, 2006 toydi
Often over time, we will want to reorganize a group of files by renaming them.
To rename *.txt to *.bak
(e.g. to rename ham.txt to ham.bak)
for f in *.txt; do mv “$f” “${f%.txt}.bak”; done
To remove ‘new-’ from new-*
(e.g. to rename new-ham.txt to ham.txt)
for f in new-*; do mv “$f” “${f#new-}”; done
${variable%pattern} vs ${variable#pattern}
The funny-looking symbol, ${f%.txt} [...]
Posted in Common, Regular Expression, for, mv | Hits: 100690 | 16 Comments »
October 17th, 2006 mysurface
Previously we have an example on regular expression, but It doesn’t shows the power of square brackets ( [ ] )
Let say you want to search for string fprintf, vprintf and sprintf using grep, usually what you do is
egrep “fprintf|vprintf|sprintf” *.c
You may be ask why don’t just uses the word “printf”? If uses the word [...]
Posted in Regular Expression, Text Manipulation, egrep | Hits: 20625 | 2 Comments »
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