String Replacing using Sed or Awk - regex

Question

Cat vols.txt (This list can fluctuate depending on the vols a system might have)
$Vol01
$Vol02
$Vol03
$Vol04
$Vol04
$Vol05
$Vol06
$Vol07
$Vol08
if I do:
cat datavols.log | sed -n 's/^\$.*/vanish \\&\.acd\*\.\* -db ! \&/gp' >> workfile.txt
I get:
cat workfile.txt
vanish $Vol01.acd*.* -db ! &
vanish $Vol02.acd*.* -db ! &
vanish $Vol03.acd*.* -db ! &
vanish $Vol04.acd*.* -db ! &
vanish $Vol05.acd*.* -db ! &
vanish $Vol06.acd*.* -db ! &
vanish $Vol07.acd*.* -db ! &
vanish $Vol08.acd*.* -db ! &
I have got 4 CPUs and I want to distribute the work between them and the output should be something like:
cat workfile.txt
Run –cpu=0 vanish $Vol01.acd*.* -db ! &
Run –cpu=1 vanish $Vol02.acd*.* -db ! &
Run –cpu=2 vanish $Vol03.acd*.* -db ! &
Run –cpu=3 vanish $Vol04.acd*.* -db ! &
Run –cpu=0 vanish $Vol05.acd*.* -db ! &
Run –cpu=1 vanish $Vol06.acd*.* -db ! &
Run –cpu=2 vanish $Vol07.acd*.* -db ! &
Run –cpu=3 vanish $Vol08.acd*.* -db ! &
Kindly help me getting this. I am not sure how to have a variable iterate between 0-3 inside SED. Thanks in advance.

Answer 1

awk 'BEGIN{i=0}{print "Run –cpu="i " vanish "$1".acd*.* -db ! &"; i=(i+1)%4}' inputfile
will produce the output as
Run –cpu=0 vanish $Vol01.acd*.* -db ! &
Run –cpu=1 vanish $Vol02.acd*.* -db ! &
Run –cpu=2 vanish $Vol03.acd*.* -db ! &
Run –cpu=3 vanish $Vol04.acd*.* -db ! &
Run –cpu=0 vanish $Vol05.acd*.* -db ! &
Run –cpu=1 vanish $Vol06.acd*.* -db ! &
Run –cpu=2 vanish $Vol07.acd*.* -db ! &
Run –cpu=3 vanish $Vol08.acd*.* -db ! &

Answer 2

You can use FNR, the current line number of the file, in awk:
awk '{print "Run -cpu=" (FNR-1)%4 " vanish " $0 ".acd*.* -db | &"}' vols.txt

Answer 3

You can also use this simple bash script .
Total_Cpu=4
Count=0
while read line ; do
if [ $Count -eq 4 ] ;then
Count=0
fi
echo $line | sed "s/^\$.*/Run –cpu=$Count vanish \&.acd*.* -db ! \&/g" >> Output_file
Count=`expr $Count + 1`
done < Input_File

Answer 4

This might work for you (GNU sed):
sed -rn '1{x;s/^/0123/;x};G;s/(.*)\n(.)(.*)/Run -cpu=\2 vanish \1.acd*.* -db ! \&\n\3\2/;P;s/.*\n//;h file
Create a line with the sequence of the cpu's you want and store it in the hold space (HS).
Append the HS to the current line and using the substitute command insert the cpu number and the required strings prepping the cpu order for the next line.
Print the string then replace the amended cpu order in the HS.

Answer 5

sed '1 {
x;s/^/Run –cpu=3 vanish :-D.acd*.* -db ! \&/;x
}
x;y/0123/1230/;G;s/\(.*sh \)[^.]\{1,\}\(.*\)\n\(.*\)/\1\3\2/;h' YourFile
a bit like potong bt using the last line as previous reference only changing the $vol content and cpu value