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Top Forums Shell Programming and Scripting Extract n-digits from string in perl Post 303003071 by rdrtx1 on Thursday 7th of September 2017 10:24:05 AM
Old 09-07-2017
Code:
line="01/05/2017 10:23:41 [ABCD-22357$0]: file.log.38: database error, MODE=SINGLE, LEVEL=critical, STATE: 01170255 (mode main"

echo "$line" | perl -e 'foreach my $str (split(/ /, <>)) {if (length($str)==8 && $str=~/^\d+$/) {print "$str\n"}; } '

echo "$line" | sed -n -r '/\b([0-9]{1,8})\b/s/.*\b([0-9]{1,8})\b.*/\1/;p;'

echo "$line" | awk 'length==8 && /^[0-9]+$/' RS=" "

for w in $line ; do if [ ${#w} = 8 ] && [ "${w/[^0-9]*}" = "$w" ] ; then { print "$w" ; } ; fi ; done

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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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