Breaking a column's value into multiple rows


 
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# 1  
Old 11-09-2010
Breaking a column's value into multiple rows

Hello Friends,

I am trying to implement the following using UNIX. I am getting a sequential file as input which would have two columns, "Name" and "Countries Visited". The "Countries Visisted" field will be multi-valued, each value separated by a space and also the number of values are not fixed. The file is tab delimited.
For example,
Name Countries Visited
A US UK CA
B US HT UG CA IN
C US
D CN PA
My intended output is this:
Name Countries Visited
A US
A UK
A CA
B US
B HT
B UG
B CA
B IN
C US
D CN
D PA
How can I use UNIX Shell Scripting to do this?
Many Thanks!!

regards
# 2  
Old 11-09-2010
Easy solution in awk:

Code:
#!/usr/bin/env ksh
awk '
        NF > 1 {
                for( i = 2; i <= NF; i++ )
                        printf( "%s %s\n", $1, $(i) );
        }
' <input_file

Strictly using shell commands:
Code:
while read name list
do
    for c in $list
    do
        echo "$name $c"
    done
done <input file

This User Gave Thanks to agama For This Post:
# 3  
Old 11-09-2010
Code:
awk 'NR==1{print;next} {for (i=2;i<=NF;i++)print $1,$i}' infile

This User Gave Thanks to rdcwayx For This Post:
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