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Changing file contents using script

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Frequent Advisor

Changing file contents using script

i have a file containing 4 feilds separated by a : . This is used by application to determine the usrer rights. File look like this


The same file existing in almost 200 systems running HP-UX 11i. Now requirement is to change the user rights in feild 3. The number varies from 0 - 4. How can i achieve this using a script. Any help is highly appriciated.

Thanks in advance
H.Merijn Brand (procura
Honored Contributor

Re: Changing file contents using script

in my opinion, but I'm probably a bit prejusiced, Perl is the obvious choise

# perl -pi -aF: -e'$F[2]++;$_=join":",@F' your_file

to increment all third fields (perl counts from 0)

# perl -pi -aF: -e'$F[0]=~/9/ and $F[2]=9;$_=join":",@F' your_file

to set field 3 to 9 if the first field has a 9 in it

# perl -pi -aF: -e'$F[0]=~/6$/ and $F[2]+=4;$_=join":",@F' your_file

to add 4 to field 3 if the first field ends with a 6

# perl -pi -aF: -e'BEGIN{%u=(user2=>4,user8=>3)}exists$f{$F[0]} and $F[2]=$u{$F[0]};$_=join":",@F' your_file

to set field 3 to 4 for field1 equal to user2, field 3 to 3 for field1 equal to user8, and field 3 unchanged for all other users

Due to the -pi option, all changes are in-place, meaning there are no pipes or temporary files involved

Enjoy, Have FUN! H.Merijn
Enjoy, Have FUN! H.Merijn
Victor Fridyev
Honored Contributor

Re: Changing file contents using script


You can try with awk as well:

awk -F: {$3=whatyouneed;print}' $SOURCE |sed 's/ /:/g'>$TMP

Naturally, you will have to define the variable "whatyouneed" according to your needs.

Entities are not to be multiplied beyond necessity - RTFM
curt larson_1
Honored Contributor

Re: Changing file contents using script


if (( $uperms > -1 && $uperms < 5 )) ;then
ex -s -c "s/\(^$userid:.*:\)[0-4]/\1$uperms/ |wq" yourfile

you might want to make a back up copy of your file before making your modification just in case