awk - replacing stings in file1 with column1 in file2 Post: 302369517

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Top Forums Shell Programming and Scripting awk - replacing stings in file1 with column1 in file2 Post 302369517 by upstate_boy on Monday 9th of November 2009 12:53:52 AM

11-09-2009

Registered User

I see where I went wrong.. my examples were not accurate. My apologies.

in file2 (ref.txt) the values look more like this:

File2:
DD 3213
CCA 1231
AA BC 1112
ADFDFF 1232
DDF SCC 2131

I ran this:

awk 'FILENAME=="ref.txt"{A[$2]=$1}
FILENAME=="master.txt"{if(A[$1]){print A[$1]}else{print $0}}' ref.txt master.txt > output.txt

Any string in file 2 that had spaces (AA BC, DDF SCC) did not work for obvious reasons. I've regenerated file 2 to look like this now with sed:

DD:3213
CCA:1231
AA BC:1112
ADFDFF:1232
DDF SCC:2131

Is there any way I can use the awk script you gave me to recognize the columns separated by the colon? I can change the colon to any other value as well if there is something that will work better with awk.

Thanks for the help and patience.

---------- Post updated at 01:39 AM ---------- Previous update was at 01:18 AM ----------

I tried this but no lucK:

awk 'FILENAME=="ref.txt"{FS = : ; A[$2]=$1}
FILENAME=="master.txt"{if(A[$1]){print A[$1]}else{print $0}}' ref.txt master.txt > results.txt

awk: FILENAME=="ref.txt"{FS = : ; A[$2]=$1}
awk: ^ syntax error

---------- Post updated at 01:53 AM ---------- Previous update was at 01:39 AM ----------

Thank you for the help vidyadhar85.

I was able to get it to work with this:

Code:

awk '
BEGIN{FS=":"}
FILENAME=="ref.txt"{A[$2]=$1}
FILENAME=="master.txt"{if(A[$1]){print A[$1]}else{print $0}}' ref.txt master.txt > results.txt

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git-symbolic-ref

GIT-SYMBOLIC-REF(1)						    Git Manual						       GIT-SYMBOLIC-REF(1)

NAME

       git-symbolic-ref - Read, modify and delete symbolic refs

SYNOPSIS

       git symbolic-ref [-m <reason>] <name> <ref>
       git symbolic-ref [-q] [--short] <name>
       git symbolic-ref --delete [-q] <name>

DESCRIPTION

       Given one argument, reads which branch head the given symbolic ref refers to and outputs its path, relative to the .git/ directory.
       Typically you would give HEAD as the <name> argument to see which branch your working tree is on.

       Given two arguments, creates or updates a symbolic ref <name> to point at the given branch <ref>.

       Given --delete and an additional argument, deletes the given symbolic ref.

       A symbolic ref is a regular file that stores a string that begins with ref: refs/. For example, your .git/HEAD is a regular file whose
       contents is ref: refs/heads/master.

OPTIONS

       -d, --delete
	   Delete the symbolic ref <name>.

       -q, --quiet
	   Do not issue an error message if the <name> is not a symbolic ref but a detached HEAD; instead exit with non-zero status silently.

       --short
	   When showing the value of <name> as a symbolic ref, try to shorten the value, e.g. from refs/heads/master to master.

       -m
	   Update the reflog for <name> with <reason>. This is valid only when creating or updating a symbolic ref.

NOTES

       In the past, .git/HEAD was a symbolic link pointing at refs/heads/master. When we wanted to switch to another branch, we did ln -sf
       refs/heads/newbranch .git/HEAD, and when we wanted to find out which branch we are on, we did readlink .git/HEAD. But symbolic links are
       not entirely portable, so they are now deprecated and symbolic refs (as described above) are used by default.

       git symbolic-ref will exit with status 0 if the contents of the symbolic ref were printed correctly, with status 1 if the requested name is
       not a symbolic ref, or 128 if another error occurs.

GIT

       Part of the git(1) suite

Git 1.8.5.3							    01/14/2014						       GIT-SYMBOLIC-REF(1)