loop with a counter on a constant in bash Post: 302546718

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Top Forums Shell Programming and Scripting loop with a counter on a constant in bash Post 302546718 by rxc23816 on Friday 12th of August 2011 02:18:04 AM

08-12-2011

Registered User

loop with a counter on a constant in bash

Hello Everyone,

I'm in need of assistance on creating a script with a counter on a certain string.

Basically this script opens a log file and displays certain log data. There are two key words in the log. START and FINISH. In between the START and FINISH is a variable ACTNUMBER. It will look like ACTNUMBER==1234 The number 1234 will vary.

So I have a variable ACTNUMBER==$ACTNUMBER

The two constants are START and FINISH
The ACTNUMBER will come between a START and FINISH.
Sometimes there are two START and two FINISH. and the ACTNUMBER will fall between those. Usually its about 3 - 4 lines of data in the log.

My ouput should look like this

START xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx ACTNUMBER==1234
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx FINISH xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

There are some instances in which there is a nested START and FINISH

The output may look like this

STARTxxxxxxxxxxxxxxxSTARTxxxxxxxxxxACTNUMBER==1234xxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxFINISHxxxxxxxx
xxxxxxxxxxxxx FINISH xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx

The x's are random log information that I need as well.

I was not able to accomplish this with grep as grep does one line at a time.

I tried with nawk using this syntax
nawk -vact="$ACTNUMBER" '$0~"START.*ACTNUMBER="act,/FINISH/' logfil

This commmand did not give me all the information I needed. It left some lines of data out, like the second line after the START. It also did not give me the second FINISH in the case of a nested START and FINISH. So it would give me a STARTxxxxxSTARTxxxxACTNUMBER==1234 xxxxx FINISH and not the second FINISH (this is four lines of data usually coming out of a log file)

I was told the only way I can do this is with a counter.

What is a good algorithm to use to increment the counter on START and decrement on FINISH?

Basically i need it to look for the line with START, find the ACT NUMBER. If it finds it then print that line. Go to next line (2nd line), even if it doesnt find START, print the line, go to next line (3rd line) look for a FINISH if it finds this line then stop, then carriage return.

In the case of a nested scenario with two START and two FINISH
Look for a START, look for another START.. Look for the ACTNUMBER. Print the line. Go to next line. Even if there is no START. Print the line. Go to third line. If there is no START or FINISH. Print the line. Go to next line. If it finds a FINISH, look for another FINISH, print line and stop - carraige return (space on next line of output)

So it needs to look for the START, ACTNUMBER and print all the lines until it finds a finish.

However I need a script with a counter for the nested scenario. I was told to use a counter for this specifcally and thats where I'm struggling.
Also needs to be a recursive loop. Can this be done with a counter and nawk?

This is on Solaris 10 Unix.

I have an idea of the proper syntax for a counter. I actually have one working that is doing a line count on the script. That works, but I'm having issues creating a counter to do an increment on START and a decrement on BEGIN and integrating this into the script to get me what i NEED.

I am super novice with unix. Any help would be appreciated.

rxc23816

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gmt_shell_functions

GMT_SHELL_FUNCTIONS.SH(1gmt)				       Generic Mapping Tools				      GMT_SHELL_FUNCTIONS.SH(1gmt)

NAME

       gmt_shell_functions.sh - Practical functions to be used in GMT bourne shell scripts

SYNOPSIS

       gmt_init_tmpdir
       gmt_remove_tmpdir
       gmt_clean_up [prefix]
       gmt_message message
       gmt_abort message
       gmt_nrecords file(s)
       gmt_nfields string
       gmt_get_field string
       gmt_get_region file(s) [options]
       gmt_get_gridregion file [options]
       gmt_get_map_width -R -J
       gmt_get_map_height -R -J
       gmt_set_psfile file
       gmt_set_framename prefix framenumber
       gmt_set_framenext framenumber

DESCRIPTION

       gmt_shell_functions.sh  provides  a  set  of  functions to Bourne (again) shell scripts in support of GMT.  The calling shell script should
       include the following line, before the functions can be used:

       . gmt_shell_functions.sh

       Once included in a shell script, gmt_shell_functions.sh allows GMT users to do some scripting more easily  than	otherwise.  The  functions
       made available are:

       gmt_init_tmpdir
	      Creates  a  temporary directory in /tmp or (when defined) in the directory specified by the environment variable TMPDIR. The name of
	      the temporary directory is returned as environment variable GMT_TMPDIR. This function also causes GMT to run  in	`isolation  mode',
	      i.e. all temporary files will be created in GMT_TMPDIR and the .gmtdefaults file will not be adjusted.

       gmt_remove_tmpdir
	      Removes the temporary directory and unsets the GMT_TMPDIR environment variable.

       gmt_cleanup
	      Remove all files and directories in which the current process number is part of the file name.  If the optional prefix is given then
	      we also delete all files and directories that begins with the given prefix.

       gmt_message
	      Send a message to standard error.

       gmt_abort
	      Send a message to standard error and exit the shell.

       gmt_nrecords
	      Returns the total number of lines in file(s)

       gmt_nfields
	      Returns the number of fields or words in string

       gmt_get_field
	      Returns the given field in a string. Must pass string between double quotes to preserve it as one item.

       gmt_get_region
	      Returns the region in the form w/e/s/n based on the data in table file(s). Optionally add -Idx/dy to round off the answer.

       gmt_get_gridregion
	      Returns the region in the form w/e/s/n based on the header of a grid file. Optionally add -Idx/dy to round off the answer.

       gmt_map_width
	      Expects the user to give the desired -R -J settings and returns the map width in the current measurement unit.

       gmt_map_height
	      Expects the user to give the desired -R -J settings and returns the map height in the current measurement unit.

       gmt_set_psfile
	      Create the output PostScript file name based on the base name of a given file (usually the script name $0).

       gmt_set_framename
	      Returns a lexically ordered filename stem (i.e., no extension) given the file prefix and the current frame number, using a width	of
	      6 for the integer including leading zeros.  Useful when creating animations and lexically sorted filenames are required.

       gmt_set_framenext
	      Accepts the current frame integer counter and returns the next integer counter.

NOTES

       1.  These functions only work in the bourne shell (sh) and their derivatives (like ash, bash, ksh and zsh).  These functions do not work in
       the C shell (csh) or their derivatives (like tcsh), and cannot be used in DOS batch scripts either.
       2. gmt_shell_functions.sh were first introduced in GMT version 4.2.2 and have since been regularly expanded with other practical  scripting
       short-cuts. If you want to suggest other functions, please do so by mailing to the GMT mailing list: gmt-help@lists.hawaii.edu.

SEE ALSO

       GMT(1), sh(1), bash(1), minmax(1), grdinfo(1)

GMT 4.5.7							    15 Jul 2011 				      GMT_SHELL_FUNCTIONS.SH(1gmt)