CODEWITHSUNDEEP
bashshellstringformatting
Hugo Sereno Ferreira
Hugo Sereno Ferreira

Reputation: 8621

Bash Format HEX string

Anyone know a standard unix command to format a running SHA1 hex string like this:

344F9DA1EA1859437077CCA38923C67797BDB8F6

into this:

344F9DA1 EA185943 7077CCA3 8923C677 97BDB8F6

Like:

echo "344F9DA1EA1859437077CCA38923C67797BDB8F6" | awk ...

Upvotes: 2

Views: 1745

Answers (6)

Dennis Williamson
Dennis Williamson

Reputation: 359845

Using pure Bash (version 3.2 or greater):

hex=344F9DA1EA1859437077CCA38923C67797BD
p='(.{8})'; unset patt; for i in {1..5}; do patt+=$p; done
[[ $hex =~ $patt ]]
string=${BASH_REMATCH[@]:1}
echo "$string"    # output: 344F9DA1 EA185943 7077CCA3 8923C677 97BDB8F6

Upvotes: 1

Martin
Martin

Reputation: 38279

Here's one option with sed:

echo "344F9DA1EA1859437077CCA38923C67797BDB8F6" | sed -E 's/.{8}/& /g'

(replace any sequence of 8 characters by itself plus one space)

Upvotes: 5

ninjalj
ninjalj

Reputation: 43688

Another one:

echo "344F9DA1EA1859437077CCA38923C67797BDB8F6" | fold -b8 | tr "\n" " "

Upvotes: 2

ataylor
ataylor

Reputation: 66059

You can do this in bash without piping at all.

bash$ FOO="344F9DA1EA1859437077CCA38923C67797BDB8F6"
bash$ echo ${FOO:0:8} ${FOO:8:8} ${FOO:16:8} ${FOO:24:8} ${FOO:32:8}
344F9DA1 EA185943 7077CCA3 8923C677 97BDB8F6

Upvotes: 3

Ezra
Ezra

Reputation: 7702

To add a space after every eighth character, try:

If the contents are on a single line in a file named FILENAME:

sed 's/.\{8\}/& /g' FILENAME

Or, if they're split across multiple lines. Again, for a file named FILENAME:

sed ':a;$!{N;s/\n//;ba;};s/.\{8\}/& /g' FILENAME

To illustrate the difference:

ezra@ubuntu:~$ cat test.file
344F9DA1EA1859437077CCA38923C67797BDB8F6
344F9DA1EA1859437077

ezra@ubuntu:~$ sed ':a;$!{N;s/\n//;ba;};s/.\{8\}/& /g' test.file
344F9DA1 EA185943 7077CCA3 8923C677 97BDB8F6 344F9DA1 EA185943 7077

ezra@ubuntu:~$ sed 's/.\{8\}/& /g' test.file
344F9DA1 EA185943 7077CCA3 8923C677 97BDB8F6
344F9DA1 EA185943 7077

Upvotes: 4

shellter
shellter

Reputation: 37248

How about

echo "344F9DA1EA1859437077CCA38923C67797BDB8F6" \
| awk '{
    printf("%s %s %s %s %s\n", 
      substr($0,1,8),  substr($0,9,8), substr($0,17,8), substr($0,25,8),
      substr($0,33,8), substr($0,41,8)    )
    }
 '

I hope this helps.

Upvotes: 1

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