Re: upper/lower case

Thanks for doing the speed test. Of course, another disadvantage of the 
while-loop script is that it hard codes (a b c d). To my understanding, 
the cut-paste script can be totally parameter-driven.

Just double-checking: The post shows IFS=',' used for while-loop script. 
Was intended IFS=';' used in actual speed test?

Daniel

On 12/12/2015 12:57 AM, Thierry Blanc [sed-users] wrote:
> speed test
>
> My concerns about a shell while loop were correct. The while-do loop is
> much slower.
>
> 1.079455912 vs. .221387482
>
>
>
> while-loop script:
>
>      #!/bin/sh
>
>      START=$(date +%s.%N)
>      while IFS=',' read a b c d
>      do
>      c="$(echo "$c" | sed -r 's/(.*)/\L\1/; s/\<(.)/\u\1/g' )"
>      echo  "$a ; $b ;$c ; $d"
>
>      done <  $1 > $2
>
>      END=$(date +%s.%N)
>      echo "$END - $START" | bc
>
>      #endofscript
>
> cut-paste script:
>
>      #!/bin/sh
>
>      START=$(date +%s.%N)
>
>      col_to_sed=3
>
>      prev_col=`expr $col_to_sed - 1`
>      next_col=`expr $col_to_sed + 1`
>
>      cut -d \;  -f -$prev_col     < $1 > cols_before.txt
>      cut -d \;  -f  $col_to_sed < $1 > cols_.txt
>      cut -d \;  -f  $next_col-    < $1 > cols_after.txt
>
>      sed -e '1b;s/.*/\L&/;s/\<./\u&/g' < cols_.txt > cols_new.txt
>
>      paste -d\;  cols_before.txt cols_new.txt cols_after.txt > output.csv
>
>      END=$(date +%s.%N)
>      echo "$END - $START" | bc
>
> #endofscript
>
>