sed command to change variable names globally

allend · 01-15-2013, 06:12 AM

Quote:

but in my case each of them DONT HAVE have the prefexed _hnlVlogCxt

I went with what you posted in your post #13

Quote:

content of file that needed to be changed now look like

_hnlVlogCxt hnlVerilogCrossViewCheck
_hnlVlogCxt hnlVerilogGetInstCDFPropLenWidValue
_hnlVlogCxt hnlVerilogNetBitSelect
_hnlVlogCxt hnlVerilogCreateMSTestFixtureFile

I read that as the content of the file that needs to be changed.

shridhar22 · 01-15-2013, 12:09 PM

Deleted

shridhar22 · 01-15-2013, 12:16 PM

@Allend after searching what went wrong in previous cases was my item list( variables needing change) had leading ^ spaces that gave a different o/p what i quoted

Quote:

content of file that needed to be changed now look like

_hnlVlogCxt hnlVerilogCrossViewCheck
_hnlVlogCxt hnlVerilogGetInstCDFPropLenWidValue
_hnlVlogCxt hnlVerilogNetBitSelect
_hnlVlogCxt hnlVerilogCreateMSTestFixtureFile

However when i removed the leading spaces from variable list in my file YOUR SCRIPT WORKED PERFECT. THanks a ton for your patience and cognizance. I tried to understand what your script is doing but being a newbie i could only understand some part of it

Quote:

file=$1 #what does this do?

while read ; do #where does read come from
sed -i.bak s/"$REPLY"/_hnlVlogCxt"${REPLY#hnlVerilog}"/g "$file"; #whats the meaning of $REPLY and #
done < File.txt

allend · 01-15-2013, 03:14 PM

Glad it now works for you and I applaud your willingness to learn.

Quote:

file=$1 #what does this do?

$1 is a bash positional parameter. When bash is invoked, $0 is set to the name of the file, and the positional parameters are set to the remaining arguments. In this script, the $1 is the filename passed by the 'find' command.

Quote:

while read ; do #where does read come from

'read' is a bash builtin command.In this script the construction

Code:

while read ; do
...
done < File.txt

causes one line at a time to be read from the standard input which has been redirected to come from File.txt.

Quote:

#whats the meaning of $REPLY and #

The line read is saved in the shell variable REPLY when no arguments are supplied.
The ${REPLY#hnlVerilog} is a bash parameter expansion that removes the prefix 'hnlVerilog' from the string in REPLY.

HTH

shridhar22 · 02-06-2013, 03:47 AM

Trying to run it on actual data today, didn't give me the desired result dont know why, the sed gave this notification on running

Quote:

find . -type f -exec t.sh '{}' \;
sed: -e expression #1, char 0: no previous regular expression
sed: -e expression #1, char 0: no previous regular expression
sed: -e expression #1, char 0: no previous regular expression
sed: -e expression #1, char 0: no previous regular expression

I am currently working on it again... and should soon be posting again about my findings and what went wrong. Till then i again thank the people who helped me specially allend.

celticdevildog · 02-06-2013, 02:36 PM

What does t.sh look like? The sed command in that script is complaining.

chrism01 · 02-06-2013, 05:28 PM

You could add

Code:

set -xv

at the top of the script. It'll show you what the parser is doing.