Shell Programming and Scripting

Please put code inside [code] tags.

getSegLatency() {
latencies=0$1
E2E=0`echo $2 | sed 's/\.000000//g'`

External commands are slow; there's no need for sed:

Code:

E2E=0${2%.*}

integer segLatency=0

There is no standard command integer (and it's unnecessary).

set -A arr `echo $latencies | sed 's/\.000000//g' | sed 's/,/ /g'`

No need for sed.

If you are using bash or ksh93, you can do that with:

Code:

IFS=,
arr=( $latencies )
IFS=$' \t\n'

res=${arr[0]}
integer i=1
while ((i < ${#arr[*]})); do

The standard syntax is:

Code:

while [ $i -lt ${#arr[*]} ]; do

((segLatency=${arr[$i]} - ${arr[$i - 1]}));

The standard syntax is:

Code:

segLatency=$(( ${arr[$i]} - ${arr[$i - 1]} ))

res="$res,$segLatency"
(( i = i + 1));

The standard syntax is:

Code:

i=$(( $i + 1 ))

done
((segLatency=$E2E - ${arr[$i - 1]}));

See previous note.

res="$res,$segLatency"
echo $res
}

With your code and that input, I get:

Code:

01,3,2,1,2

It seems reasonably snappy to me, despite the unnecessary use of sed

Code:

getSegLatency() {
  IFS=,
  set -- $*
  IFS=$' \t\n'
  result=$(
    while [ $# -ge 2 ]
    do
      printf "%d," $(( (${1%.*} - ${2%.*}) * -1 ))
      shift
   done )
   printf "%s\n" ${result%,}
}