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Full Discussion: Help with the awk syntax
Top Forums Shell Programming and Scripting Help with the awk syntax Post 302817831 by shamrock on Thursday 6th of June 2013 02:02:35 PM
Old 06-06-2013
Quote:
Originally Posted by juzz4fun
Hello Experts:

While writing a script to help one of the posts on here, I end up writing a wrong one. I am very much eager to know how this can be corrected.
Aim was not to print specified columns - lets say out of 100 fields, need to print all but 5th, 10th, 15th columns.
Someone already answered it - $5=$10=$15="". This also should work.
I was thinking in another way to do it: Store the fields that needs to be excluded, in a separate file - nofields

Below is the script that I wrote:

awk 'NR==FNR{a[$1];next}{for (i = 1; i <= NF; i++)if(i not in a)print $i}' nofields input

I am sure there is mistakes in it, but interested in knowing what it is.
Setting $5 $10 and $15 to null is the way to go but if you want to do it using an exclude file then here's how...
Code:
awk '{if (NR==FNR) a[$1]; else {for (i=1; i<=NF; i++) if (!(i in a)) printf("%s", i<NF ? $i FS : $i "\n")}' nofields input


Last edited by shamrock; 06-06-2013 at 03:03 PM.. Reason: Beaten by Yoda to the pip...
 

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GIT-SH-I18N(1)							    Git Manual							    GIT-SH-I18N(1)

NAME
git-sh-i18n - Git's i18n setup code for shell scripts SYNOPSIS
. "$(git --exec-path)/git-sh-i18n" DESCRIPTION
This is not a command the end user would want to run. Ever. This documentation is meant for people who are studying the Porcelain-ish scripts and/or are writing new ones. The 'git sh-i18n scriptlet is designed to be sourced (using .) by Git's porcelain programs implemented in shell script. It provides wrappers for the GNU gettext and eval_gettext functions accessible through the gettext.sh script, and provides pass-through fallbacks on systems without GNU gettext. FUNCTIONS
gettext Currently a dummy fall-through function implemented as a wrapper around printf(1). Will be replaced by a real gettext implementation in a later version. eval_gettext Currently a dummy fall-through function implemented as a wrapper around printf(1) with variables expanded by the git-sh- i18n--envsubst(1) helper. Will be replaced by a real gettext implementation in a later version. GIT
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