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How do I extract information from a string

I am trying to pull a dynamic out of a load I am running using bash. I got to the point where I get the string I want, now I want to get some information out of it that can change. The returned string looks like this:

Records: 2910 Deleted: 0 Skipped: 0 Warnings: 0

Each of the numbers can and will vary in length, but the overall structure will remain the same. What I want to do is get these numbers and load them into some bash variables, namely:

RECORDS=??
DELETED=??
SKIPPED=??
WARNING=??

In a regex, I would do it like this:

Records: (\d*?) Deleted: (\d*?) Skipped (\d*?) Warnings (\d*?)

and use 4 groups in my variables.

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5 answers


You can use regex matching in Bash> 3.2 versions:



[[ $line =~ ([[:digit:]]+).*([[:digit:]]+).*([[:digit:]]+).*([[:digit:]]+) ]]

RECORDS=${BASH_REMATCH[1]}
DELETED=${BASH_REMATCH[2]}
SKIPPED=${BASH_REMATCH[3]}
WARNING=${BASH_REMATCH[4]}
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The builtin command read

will do the trick:

read TMP1 RECORDS TMP2 DELETED TMP3 SKIPPED TMP4 WARNING


Update . You can also use set

:

set $line
RECORDS=$2
DELETED=$4
SKIPPED=$6
WARNING=$8
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You can use a shell function here that just creates multiple name / value pairs. It assumes everything is formatted as you said, but easy to change:

parseline() {
    while [ $# -ge 2 ] ; do
        eval $(echo $1 | tr -d : | tr '[a-z]' '[A-Z]')="$2"
        shift 2
    done
}

Run it like:

$ parseline Records: 2910 Deleted: 0 Skipped: 0 Warnings: 0
$ echo $RECORDS
2910
$ echo $WARNINGS
0
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You can try something with "sed" or "cut" depending on the structure of the line:

#!/bin/sh                                                                       

DYNAMIC="Records: 2910 Deleted: 1 Skipped: 2 Warnings: 3"

RECORDS=`echo "$DYNAMIC" | sed 's/.*Records: \([0-9]*\).*/\1/g'`
DELETED=`echo "$DYNAMIC" | sed 's/.*Deleted: \([0-9]*\).*/\1/g'`
SKIPPED=`echo "$DYNAMIC" | sed 's/.*Skipped: \([0-9]*\).*/\1/g'`
WARNINGS=`echo "$DYNAMIC" | sed 's/.*Warnings: \([0-9]*\).*/\1/g'`

echo "Records $RECORDS"
echo "Deleted $DELETED"
echo "Skipped $SKIPPED"
echo "Warnings $WARNINGS"

echo "$DYNAMIC" | cut -d " " -f2
echo "$DYNAMIC" | cut -d " " -f4
echo "$DYNAMIC" | cut -d " " -f6
echo "$DYNAMIC" | cut -d " " -f8
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#!/bin/bash
s="Records: 2910 Deleted: 0 Skipped: 0 Warnings: 0"
s=${s//: /=}
for i in $(printf ${s// /"\n"})
do
 eval $i
done

echo "Records: $Records"
echo "Deleted: $Deleted"
echo "Skipped: $Skipped"
echo "Warnings: $Warnings"

Exit

$ ./shell.sh
Records: 2910
Deleted: 0
Skipped: 0
Warnings: 0
0


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