12-09-2009
Getting number of lines of nth occurrency
Hi all,
I would like to extract the line number of the n-th occurrency of a given string in a file.
e.g.
xxx
yyy
xxx
zzz
xxx
the second occurrency of xxx is at line 3.
What is the fastest way to do it in bash?
Thank you,
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GUARDS(1) User Contributed Perl Documentation GUARDS(1)
NAME
guards - select from a list of files guarded by conditions
SYNOPSIS
guards [--prefix=dir] [--path=dir2:dir2:...] [--default=0|1] [-v|--invert-match] [--list|--check] [--config=file] symbol ...
DESCRIPTION
The script reads a configuration file that may contain so-called guards, file names, and comments, and writes those file names that satisfy
all guards to standard output. The script takes a list of symbols as its arguments. Each line in the configuration file is processed
separately. Lines may start with a number of guards. The following guards are defined:
+xxx Include the file(s) on this line if the symbol xxx is defined.
-xxx Exclude the file(s) on this line if the symbol xxx is defined.
+!xxx Include the file(s) on this line if the symbol xxx is not defined.
-!xxx Exclude the file(s) on this line if the symbol xxx is not defined.
- Exclude this file. Used to avoid spurious --check messages.
The guards are processed left to right. The last guard that matches determines if the file is included. If no guard is specified, the
--default setting determines if the file is included.
If no configuration file is specified, the script reads from standard input.
The --check option is used to compare the specification file against the file system. If files are referenced in the specification that do
not exist, or if files are not enlisted in the specification file warnings are printed. The --path option can be used to specify which
directory or directories to scan. Multiple directories are eparated by a colon (":") character. The --prefix option specifies the location
of the files.
AUTHOR
Andreas Gruenbacher <agruen@suse.de> (SuSE Linux AG)
perl v5.12.1 2010-07-05 GUARDS(1)