Regex

pppswing · #1 (**permalink**) 06-30-2008

Hello
I need to make a regex.

I have a file myfile, in this file I want to find a number situated after PAYSLOT=
Before PAYSLOT is the begining of line (I guess

Code:

) and
after the number is the end of line (I guess

Code:

) .
I want to echo this number (I guess

Code:

$1

) and put it in my variable payslot.

Code:

payslot=`cat $myfile | grep PAYSLOT | awk \^PAYSLOT=($1)$\ `

ghostdog74 · #2 (**permalink**) 06-30-2008

if that is the case, regexp is not needed. KISS

Code:

awk -F"=" '{print $NF}'  myfile

risby · #3 (**permalink**) 06-30-2008

Quote:

Originally Posted by ghostdog74

if that is the case, regexp is not needed. KISS

Code:

awk -F"=" '{print $NF}'  myfile

If you want to KISS it then the cat isn't required but the grep is if the file contains more lines than just the one starting with PAYSLOT:

Code:

payslot=`grep PAYSLOT $myfile | awk -F"=" '{print $NF}'`

but if you want to use the regex then sed might do:

Code:

payslot=`grep PAYSLOT $myfile | sed -e 's/^PAYSLOT=\([0123456789]\+\)$/\1/'`

ghostdog74 · #4 (**permalink**) 06-30-2008

Quote:

Originally Posted by risby

If you want to KISS it then the cat isn't required but the grep is if the file contains more lines than just the one starting with PAYSLOT:

Code:

payslot=`grep PAYSLOT $myfile | awk -F"=" '{print $NF}'`

i hope you are not responding to me. the above is simply

Code:

payslot=`awk -F"=" '/PAYSLOT/{print $NF}'`

Quote:

but if you want to use the regex then sed might do:

Code:

payslot=`grep PAYSLOT $myfile | sed -e 's/^PAYSLOT=\([0123456789]\+\)$/\1/'`

i am sure grep is not needed here too, unless i mistaken about the requirement

risby · #5 (**permalink**) 06-30-2008

Quote:

Originally Posted by ghostdog74

i hope you are not responding to me. the above is simply

Code:

payslot=`awk -F"=" '/PAYSLOT/{print $NF}'`

i am sure grep is not needed here too, unless i mistaken about the requirement

I was responding to you ghostdog74. The example code you have given above will not store anything in the environment variable because no input is specified to the awk command.

Also, if you leave out the grep you are assuming that the input file does not contain anything other than the single line starting with "PAYSLOT". The OP does not say that that is the case.

Hope this helps

ghostdog74 · #6 (**permalink**) 06-30-2008

Quote:

Originally Posted by risby

I was responding to you ghostdog74. The example code you have given above will not store anything in the environment variable because no input is specified to the awk command.

Code:

awk -F"=" '/^PAYSLOT/{print $NF}'  myfile

that should do it.

Quote:

Also, if you leave out the grep you are assuming that the input file does not contain anything other than the single line starting with "PAYSLOT". The OP does not say that that is the case.

Hope this helps

this:

Code:

grep PAYSLOT $myfile | awk -F"=" '{print $NF}'

is the same as this:

Code:

awk -F"=" '/PAYSLOT/{ print $NF}' $myfile

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