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Sed save changes to same file in loop

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Top Forums Shell Programming and Scripting Sed save changes to same file in loop
# 8  
Old 08-01-2010
MySQL
Quote:
Originally Posted by Scrutinizer
Hi, your original idea seems sound to me except for the double quotes as scottn suggested, plus you need a revised regex syntax so that the operations are restricted to the intended fields:

Code:
var="1;2"
IFS=";" 
for i in $var
do
    sed "s/[^;]*;/;/$i" $file  > $temp  &&  mv $temp $file
done

output:
Code:
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10

using var="1;3"
Code:
;31-JUL-10;;29-JUL-10;30-JUL-10;30-JUL-10
;31-JUL-10;;29-JUL-10;30-JUL-10;30-JUL-10
;31-JUL-10;;29-JUL-10;30-JUL-10;30-JUL-10

I actually not understood what alienated wants ? Smilie
I understand now so wanted thing Smilie

My method Smilie

Code:
#!/bin/bash
var=( "1" "2" )
val="[0-9]*-[A-Z]*-[0-9]*"
first=${var[0]}
end=$((${var[1]}-1))
sed "s/${val};/;/$first" file | sed "s/;${val};/;;/$end" > temp
      more temp

Code:
 
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10
;;29-JUL-10;29-JUL-10;30-JUL-10;30-JUL-10

when

Code:
 
var=( "1" "3" )

The output Smilie

Code:
;31-JUL-10;29-JUL-10;;30-JUL-10;30-JUL-10
;31-JUL-10;29-JUL-10;;30-JUL-10;30-JUL-10
;31-JUL-10;29-JUL-10;;30-JUL-10;30-JUL-10

# 9  
Old 08-01-2010
Portably avoiding the temp file shuffle with ed:
Code:
var=1\;2
IFS=\;
{ printf '1,$s/[^;]*;/;/%d\n' $var;  printf 'w\nq\n'; } | ed -s "$file"

or
Code:
var=1\;2
IFS=\;
ed -s "$file" <<EOED
$(printf '1,$s/[^;]*;/;/%d\n' $var)
w
q
EOED

Regards,
Alister
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