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up vote 2 down vote favorite

I have a variable with some text in it. I need to get a specific bit of information out of it. For example I have

export OUTPUT="Running \"protractor:admin\" (protractor) task Using ChromeDriver directly... [launcher] Running 1 instances of WebDriver Jasmine version: 1.3.1 revision 1354556913 SauceOnDemandSessionID=5c72e54365e9bb559ea389dc164ba754 job-name=Admin"

I need 5c72e54365e9bb559ea389dc164ba754 in an variable SAUCE_ID. The actual SessionID changes each run of the script so I need someway to pull it out. It is always preceded by SauceOnDemandSessionID= and followed by job-name=.

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3 Answers 3

up vote 3 down vote accepted

Use the shell's string manipulation features that come with parameter expansion. These features are present in all non-antique Bourne-style shells including dash, bash and ksh.

suffix=${OUTPUT#*SauceOnDemandSessionID=}
SAUCE_ID=${suffix%%[!0-9A-Fa-f]*}
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up vote 0 down vote

If the ID is always the same length, and composed of only the letters a through f and numbers, and there are no similar strings in the output, you could do this:

SAUCE_ID="$(echo $OUTPUT | egrep -o '[0-9a-f]{32}')"

It searches for a string of 32 characters that are either a number in 0-9 or a letter in a-f.

To allow variation in the length of the string, use something like this:

SAUCE_ID="$(echo $OUTPUT | egrep -o '[0-9a-f]{26,38}')"

This example matches any of those strings with between 26 and 38 characters. You could also use this to match strings with at least 26 characters:

SAUCE_ID="$(echo $OUTPUT | egrep -o '[0-9a-f]{26,}')"
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Unfortunately, I'm not 100% the length will always be 32. –  Justin808 Apr 23 at 0:09
    
It's possible to allow multiple lengths. I edited my answer with an example. –  Ringstaart Apr 23 at 0:12
up vote 0 down vote

Using grep with PCRE, you can use the regex:

SauceOnDemandSessionID=\K[^ ]*(?= job-name)

Test:

$ SAUCE_ID=$(grep -Po "SauceOnDemandSessionID=\K[^ ]*(?= job-name)" <<< "$OUTPUT")
$ echo "$SAUCE_ID"
5c72e54365e9bb559ea389dc164ba754

It will be work in all cases given you have SauceOnDemandSessionID= before and job-name after the pattern.

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I get: usage: grep [-abcDEFGHhIiJLlmnOoPqRSsUVvwxZ] [-A num] [-B num] [-C[num]] [-e pattern] [-f file] [--binary-files=value] [--color=when] [--context[=num]] [--directories=action] [--label] [--line-buffered] [--null] [pattern] [file ...] –  Justin808 Apr 23 at 0:09
    
@Justin808: How did you run it? –  heemayl Apr 23 at 0:12

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