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Full Discussion: How to delete everything present on left (or right) of a substring?
Top Forums UNIX for Beginners Questions & Answers How to delete everything present on left (or right) of a substring? Post 303041022 by RudiC on Tuesday 12th of November 2019 10:21:39 AM
Old 11-12-2019
man awk:
Quote:
match(s,r)
Returns the index of the first longest match of regular expression r in string s. Returns 0 if no match. As a side effect, RSTART is set to the return value. RLENGTH is set to the length of the match or -1 if no match. If the empty string is matched, RLENGTH is set to 0, and 1 is returned if the match is at the front, and length(s)+1 is returned if the match is at the back.
The match searches $0 for your target string PCX..._1 (the ellipsis replaced by [^_]*, i.e. non-"_" characters), and, if found, sets RSTART and RLENGTH accordingly for immediate use by the substr function.


BTW, that awk scriptlet doesn't need the upfront grep (as it checks lines for PROTOBUF_DIRS already and on its own), and it can be adapted to also make the uniq redundant.
Last edited by RudiC; 11-13-2019 at 01:51 PM..
These 2 Users Gave Thanks to RudiC For This Post:
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LEARN ABOUT CENTOS

fprintd

fprintd(1)																fprintd(1)

NAME

       fprintd - Fingerprint management daemon, and test applications

SYNOPSYS

       fprintd-enroll [username]

       fprintd-list username [usernames...]

       fprintd-verify [-f finger] [usename]

       fprintd-delete username [usernames...]

DESCRIPTION

       This manual page documents briefly the fprintd command-line utilities.

       The fprintd daemon is accessed through D-Bus by those command-line utilities.

ARGUMENTS

       username
	       The username for the user for which you want to query or modify the fingerprint database.

	       Not that fprintd-list and fprintd-delete require at least one username to be passed, and support multiple usernames.

	       fprintd-enroll and fprintd-verify will use the current username if none are passed on the command-line.

       -f finger
	       For fprintd-enroll, the finger to enroll. Possible values are:

	       left-thumb, left-index-finger, left-middle-finger, left-ring-finger, left-little-finger, right-thumb, right-index-finger, right-
	       middle-finger, right-ring-finger, right-little-finger.

	       The default is automatic, selecting the first available finger for swipe devices, or all the enrolled fingers, for press devices.

TEST APPLICATIONS

   fprintd-enroll
	       Will enroll the user's right index finger into the database.

   fprintd-list
	       Will list the user's enrolled fingerprints.

   fprintd-verify
	       Will enroll the user's right index finger into the database.

   fprintd-enroll
	       Will enroll the user's right index finger into the database.

AUTHOR

       fprintd was written by Bastien Nocera and Daniel Drake.

DIRECTORIES

       By default, fprintd stores the fingerprints in /var/lib/fprint/

SEE ALSO

       dbus-daemon, gnome-about-me

freedesktop							    2014-06-10								fprintd(1)
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