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Full Discussion: How to extract string between two specified characters and end of line?
Top Forums UNIX for Beginners Questions & Answers How to extract string between two specified characters and end of line? Post 303044817 by Dip_1985 on Wednesday 4th of March 2020 02:42:11 PM
Old 03-04-2020
Thanks for the suggestion. that worked. But now the last part of replacing it in a different file is not working. I tried the below two codes.

Code:
#!/bin/bash
while read line
do
key= echo "$line" | sed 's/\(.*\)\=.*/\1/' 
value= echo "$line" | sed 's/.*\=//'
sed 's/$key/$value/g' test.txt
done < bbb.tx

Code:
#!/bin/bash
input=/home/wip4599/test.txt
while read line
do
key= echo "$line" | sed 's/\(.*\)\=.*/\1/' 
value= echo "$line" | sed 's/.*\=//'
sed 's/$key/$value/g' $input
done < bbb.txt

--- Post updated at 08:04 PM ---

@MadeInGermany

--- Post updated at 08:42 PM ---

used the below format and it worked

Code:
key=$(echo "$line" | sed 's/\(.*\)\=.*/\1/')

Last edited by Scrutinizer; 03-04-2020 at 03:54 PM.. Reason: code tags
 

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LEARN ABOUT CENTOS

trace-cmd-extract

TRACE-CMD-EXTRACT(1)													      TRACE-CMD-EXTRACT(1)

NAME

       trace-cmd-extract - extract out the data from the Ftrace Linux tracer.

SYNOPSIS

       trace-cmd extract [OPTIONS]

DESCRIPTION

       The trace-cmd(1) extract is usually used after trace-cmd-start(1) and trace-cmd-stop(1). It can be used after the Ftrace tracer has been
       started manually through the Ftrace pseudo file system.

       The extract command creates a trace.dat file that can be used by trace-cmd-report(1) to read from. It reads the kernel internal ring buffer
       to produce the trace.dat file.

OPTIONS

       -p plugin
	   Although extract does not start any traces, some of the plugins require just reading the output in ASCII format. These are the latency
	   tracers, since the latency tracers have a separate internal buffer. The plugin option is therefore only necessary for the wakeup,
	   wakeup-rt, irqsoff, preemptoff and preemptirqsoff plugins.

	       With out this option, the extract command will extract from the internal
	       Ftrace buffers.

       -O option
	   If a latency tracer is being extracted, and the -p option is used, then there are some Ftrace options that can change the format. This
	   will update those options before extracting. To see the list of options see trace-cmd-list. To enable an option, write its name, to
	   disable the option append the characters no to it. For example: noprint-parent will disable the print-parent option that prints the
	   parent function in printing a function event.

       -o outputfile
	   By default, the extract command will create a trace.dat file. This option will change where the file is written to.

SEE ALSO

       trace-cmd(1), trace-cmd-record(1), trace-cmd-report(1), trace-cmd-start(1), trace-cmd-stop(1), trace-cmd-reset(1), trace-cmd-split(1),
       trace-cmd-list(1), trace-cmd-listen(1)

AUTHOR

       Written by Steven Rostedt, <rostedt@goodmis.org[1]>

RESOURCES

       git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/trace-cmd.git

COPYING

       Copyright (C) 2010 Red Hat, Inc. Free use of this software is granted under the terms of the GNU Public License (GPL).

NOTES

	1. rostedt@goodmis.org
	   mailto:rostedt@goodmis.org

								    06/11/2014						      TRACE-CMD-EXTRACT(1)
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