Re: upper/lower case

this is a parameter driven pure sed script (apart from the oxymoron ;-) ).
The speed is remarkable. See below

puresed.sh
#!/bin/bash

COL=$2
((COL--))

MAXCOL=$(sed -n 's|,|\n|gp;q' $1 |wc -l)
((MAXCOL--))

let "COL2 = $MAXCOL - $COL"

n1="$(printf "%${COL}s" |sed 's| |n;|g')"
n2="$(printf "%${COL2}s" |sed 's| |n;|g')"
N="$(printf "%${MAXCOL}s" |sed 's| |N;|g')"

sed  's|,|\n|g' $1 |sed -r  "$n1;s|[A-Z]+|\L\u\0|g;$n2" |\
sed "$N;s|\n|,|g" > output

---

process.sh
#!/bin/sh

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
---


$ ./puresed.sh test.csv 3
.354332867
$ ./puresed.sh test.csv 3
.347485474
$ ./puresed.sh test.csv 3
.345228981
$ ./puresed.sh test.csv 3
.398209122
$ ./process.sh test.csv 3
1.250124104
$ ./process.sh test.csv 3
1.242909844
$ ./process.sh test.csv 3
1.236377148
$ ./process.sh test.csv 3
1.240610077

On 12/12/15 19:19, Daniel Goldman [email protected] [sed-users] wrote:
> 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
>>
>>
>
> ------------------------------------
> Posted by: Daniel Goldman <[email protected]>
> ------------------------------------
>



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