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Top Forums Shell Programming and Scripting How find Linux version from command line? Post 302915176 by RavinderSingh13 on Monday 1st of September 2014 07:54:59 AM
Old 09-01-2014
Posted by SriniShoo:

Quote:
Both the codes give you 6 as the output


Code:
rev /etc/redhat-release | cut -f2 -d ' ' | rev | cut -f1 -d '.'

of


Code:
cut -f1 -d '.' /etc/redhat-release | rev | cut -f1 -d ' ' | rev
Hello SriniShoo,

I am not sure why you are using rev here, I guess we can esaily do it with cut and sed.


EDIT: Also you have missed sed while giving sed solutions.
Quote:
Both the codes give you 6 as the output

Code:
rev /etc/redhat-release | cut -f2 -d ' ' | rev | cut -f1 -d '.'

of


Code:
cut -f1 -d '.' /etc/redhat-release | rev | cut -f1 -d ' ' | rev

---------- Post updated at 07:54 AM ---------- Previous update was at 07:49 AM ----------

sed solution


Code:
's/[^[:digit:]]*\([[:digit:]]*\)\..*/\1/' /etc/redhat-release
Code:
sed 's/[^[:digit:]]*\([[:digit:]]*\)\..*/\1/' /etc/redhat-release

Thanks,
R. Singh
 

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MB_STRCUT(3)								 1							      MB_STRCUT(3)

mb_strcut - Get part of string

SYNOPSIS
string mb_strcut (string $str, int $start, [int $length = NULL], [string $encoding = mb_internal_encoding()]) DESCRIPTION
mb_strcut(3) extracts a substring from a string similarly to mb_substr(3), but operates on bytes instead of characters. If the cut position happens to be between two bytes of a multi-byte character, the cut is performed starting from the first byte of that character. This is also the difference to the substr(3) function, which would simply cut the string between the bytes and thus result in a malformed byte sequence. PARAMETERS
o $str - The string being cut. o $start - Starting position in bytes. o $length - Length in bytes. If omitted or NULL is passed, extract all bytes to the end of the string. o $encoding -The $encoding parameter is the character encoding. If it is omitted, the internal character encoding value will be used. RETURN VALUES
mb_strcut(3) returns the portion of $str specified by the $start and $length parameters. SEE ALSO
mb_substr(3), mb_internal_encoding(3). PHP Documentation Group MB_STRCUT(3)
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