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Full Discussion: Join 2 separate strings into one with alternate tokens.
Top Forums Shell Programming and Scripting Join 2 separate strings into one with alternate tokens. Post 302536789 by ctsgnb on Wednesday 6th of July 2011 08:38:14 AM
Old 07-06-2011
basically it transform whatever1:whatever2 into whatever2:whatever1

It switches 2 columns that are separated with colon but in details ...

sed 's/RE/PATTERN/'|replace the first found regular expression 'RE' with the pattern 'PATTERN'


^the line start with
\(beginning of the description of a regular expression that can be back referenced later as \1
[start defininf a list of element
^negation of the list
:element
]end of list of possible element
*previous definition repeated 0 or more times
\)End of the regular expression to which we can later refer as \1
:colon (taken litterally)
\(beginning of the description of a regular expression that can be back referenced later as \2
[^:]*any character that is NOT a colon repeated 0 or more times
\)End of the regular expression to which we can later refer as \2
/separator to start the description of PATTERN
\2back reference to the second \( \) previously defined
:colon (taken litteraly)
\1back reference to the first \( \) previously defined
/separator to start the description of PATTERN
Last edited by ctsgnb; 07-06-2011 at 10:23 AM..
These 2 Users Gave Thanks to ctsgnb For This Post:
Neo sikku
 

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LEARN ABOUT PLAN9

gid

GID(1)								   User Commands							    GID(1)

NAME

       gid - Query ID database and report results.

SYNOPSIS

       gid [OPTION]... PATTERN...

DESCRIPTION

       Query  ID database and report results.  By default, output consists of multiple lines, each line containing the matched identifier followed
       by the list of file names in which it occurs.

       -f, --file=FILE
	      file name of ID database

       -i, --ignore-case
	      match PATTERN case insensitively

       -l, --literal
	      match PATTERN as a literal string

       -r, --regexp
	      match PATTERN as a regular expression

       -w, --word
	      match PATTERN as a delimited word

       -s, --substring
	      match PATTERN as a substring

	      Note: If PATTERN contains extended regular expression metacharacters, it is interpreted as a regular expression  substring.   Other-
	      wise, PATTERN is interpreted as a literal word.

       -k, --key=STYLE
	      STYLE is one of `token', `pattern' or `none'

       -R, --result=STYLE
	      STYLE is one of `filenames', `grep', `edit' or `none'

       -S, --separator=STYLE
	      STYLE is one of `braces', `space' or `newline' and only applies to file names when `--result=filenames'

	      The above STYLE options control how query results are presented.	Defaults are --key=token --result=filenames --separator=space

       -F, --frequency=FREQ
	      find tokens that occur FREQ times, where FREQ is a range expressed as `N..M'.  If N is omitted, it defaults to 1, if M is omitted it
	      defaults to MAX_USHRT

       -a, --ambiguous=LEN
	      find tokens whose names are ambiguous for LEN chars

       -x, --hex
	      only find numbers expressed as hexadecimal

       -d, --decimal
	      only find numbers expressed as decimal

       -o, --octal
	      only find numbers expressed as octal

	      By default, searches match numbers of any radix.

       --help display this help and exit

       --version
	      output version information and exit

REPORTING BUGS

       Report bugs to bug-idutils@gnu.org

SEE ALSO

       The full documentation for gid is maintained as a Texinfo manual.  If the info and gid programs are properly installed at  your	site,  the
       command

	      info gid

       should give you access to the complete manual.

gid - 4.5							    August 2010 							    GID(1)
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