CODEWITHSUNDEEP
awksed
Dickens A S
Dickens A S

Reputation: 4054

Bash Extract first number of a three digit version

I would like to extract number 10 from 10.3.0 for Makefile to add specific CFLAGS
Below code is printing only 1030

echo "gcc.exe (Rev5, Built by MSYS2 project) 10.3.0"|sed -r 's/.* ([0-9])/\1/g' | sed -r 's/\.//g'
1030

How to get the 10

Upvotes: 5

Views: 571

Answers (5)

RavinderSingh13
RavinderSingh13

Reputation: 133640

With shown samples, you could try following. Simple explanation would be, make . and ) as field separators and print 3rd field if NF is greater than 2 for that line, to get required output as per shown samples.

echo "gcc.exe (Rev5, Built by MSYS2 project) 10" | 
awk -F'\\.|\\) ' 'NF>=2{print $3}'

Upvotes: 2

The fourth bird
The fourth bird

Reputation: 163467

You code using sed gives 1030 as a result because s/.* ([0-9])/\1/g will leave 10.3.0 and then s/\.//g will remove all the dots leaving 1030.

You could match the format ^[0-9]+\.[0-9]+\.[0-9]+$ of the last field $NF, and if it matches split on a dot and print the first part.

echo "gcc.exe (Rev5, Built by MSYS2 project) 10.3.0" | awk 'match($NF, /^[0-9]+\.[0-9]+\.[0-9]+$/) {
    split($NF,a,"."); print a[1]
}
'

Output

10

Upvotes: 2

Carlos Pascual
Carlos Pascual

Reputation: 1126

This solution using the awk functions match() and substr():

echo 'gcc.exe (Rev5, Built by MSYS2 project) 10.3.0' | awk 'match($0, /[[:digit:]]+\./) {print substr($0,RSTART,RLENGTH-1)}'
10

Upvotes: 2

Tyl
Tyl

Reputation: 5252

Just a tiny tweak to your own solution would do:

echo "gcc.exe (Rev5, Built by MSYS2 project) 10.3.0"|sed -r 's/.* ([0-9])/\1/g' | sed -r 's/\..*//g'
10

Actually the second sed is not needed here:

echo "gcc.exe (Rev5, Built by MSYS2 project) 10.3.0"|sed -r 's/.* ([0-9]+).*/\1/g'
10

What happened is that you replaced things before 10 but not after it, which can be easily fixed.

Upvotes: 3

anubhava
anubhava

Reputation: 785611

A simple awk:

echo "gcc.exe (Rev5, Built by MSYS2 project) 10.3.0" | awk '{print int($NF)}'
10

Or if you must use sed only then:

echo "gcc.exe (Rev5, Built by MSYS2 project) 10.3.0" |
sed -E 's/.* ([0-9]+).*/\1/'

10

Upvotes: 6

Related Questions