Grep data from a file bash shell script

Question

I have file named shadow.lab4 which contain below characters and stored in desktop:

$6$bIhKGKp3$LSd47ADZexr.4rBm8y29DLPfd1kxwyuliCea8fExg0ohMT25OAEqUOxKm7t6dj/M50PjACjD.gn.VDD8f4MVy0

Now I am trying to retrieve the encrypted data by using grep command and store it inside variable encr. Then show retrieved data on the screen by using

echo $encr

My expected output should be

LSd47ADZexr.4rBm8y29DLPfd1kxwyuliCea8fExg0ohMT25OAEqUOxKm7t6dj/M50PjACjD.gn.VDD8f4MVy0

Do you know code that I have to use to get my expected output by using 'grep'?

The line does not contain sekew; there is no : for the first cut. Your post is very inconsistent. Please update the input data to match the commands in the pipeline. — Jim Garrison
– Jim Garrison, Commented Sep 2, 2012 at 6:29
Also in the general case you should usually double-quote your variable interpolations; echo "$encr" — tripleee
– tripleee, Commented Sep 2, 2012 at 6:47
I have made changes to the question to make it more clear to be understood. — muhihsan
– muhihsan, Commented Sep 2, 2012 at 6:55

user529758 · Accepted Answer · 2012-09-02 06:31:58Z

3

I don't know why you use ":" as a separator for cut, but there's no colon at all in your input string. Change the cut part of the script to

cut -d '$' -f 4

answered Sep 2, 2012 at 6:31

user529758

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Steve · Accepted Answer · 2012-09-02 23:53:39Z

1

ENCR:

If the encryption is always the 4th field in the string:

encr=$(awk -F "$" '{ print $4 }' shadow.lab4)

If the encryption is always the last field in the string:

encr=$(awk -F "$" '{ print $NF }' shadow.lab4)

Results:

echo "$encr"
LSd47ADZexr.4rBm8y29DLPfd1kxwyuliCea8fExg0ohMT25OAEqUOxKm7t6dj/M50PjACjD.gn.VDD8f4MVy0

SALT:

To access the salt, if it's always the third field:

salt=$(awk -F "$" '{ print $3 }' shadow.lab4)

To access the salt, if it's always the second last field:

salt=$(awk -F "$" '{ print $(NF-1) }' shadow.lab4)

Results:

echo "$salt"
bIhKGKp3

edited Sep 2, 2012 at 23:53

answered Sep 2, 2012 at 8:08

Steve

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1 Comment

muhihsan Over a year ago

hi, thanks a lot. then how can I take $bIhKGKp3 (which is salt of the encryption) from that file?

Lev Levitsky · Accepted Answer · 2012-09-02 08:34:45Z

0

sed way:

encr = `sed 's/.*\$//' file.txt

answered Sep 2, 2012 at 8:34

Lev Levitsky

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