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Test Your Knowledge in Computers #65
Difficulty: Easy
In the TCP/IP model, end-to-end connectivity is provided from host-to-host in the transport layer.
True or False?
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expr(1) [xfree86 man page]

EXPR(1) 							   User Commands							   EXPR(1)

NAME
expr - evaluate expressions SYNOPSIS
expr EXPRESSION expr OPTION DESCRIPTION
--help display this help and exit --version output version information and exit Print the value of EXPRESSION to standard output. A blank line below separates increasing precedence groups. EXPRESSION may be: ARG1 | ARG2 ARG1 if it is neither null nor 0, otherwise ARG2 ARG1 & ARG2 ARG1 if neither argument is null or 0, otherwise 0 ARG1 < ARG2 ARG1 is less than ARG2 ARG1 <= ARG2 ARG1 is less than or equal to ARG2 ARG1 = ARG2 ARG1 is equal to ARG2 ARG1 != ARG2 ARG1 is unequal to ARG2 ARG1 >= ARG2 ARG1 is greater than or equal to ARG2 ARG1 > ARG2 ARG1 is greater than ARG2 ARG1 + ARG2 arithmetic sum of ARG1 and ARG2 ARG1 - ARG2 arithmetic difference of ARG1 and ARG2 ARG1 * ARG2 arithmetic product of ARG1 and ARG2 ARG1 / ARG2 arithmetic quotient of ARG1 divided by ARG2 ARG1 % ARG2 arithmetic remainder of ARG1 divided by ARG2 STRING : REGEXP anchored pattern match of REGEXP in STRING match STRING REGEXP same as STRING : REGEXP substr STRING POS LENGTH substring of STRING, POS counted from 1 index STRING CHARS index in STRING where any CHARS is found, or 0 length STRING length of STRING + TOKEN interpret TOKEN as a string, even if it is a keyword like 'match' or an operator like '/' ( EXPRESSION ) value of EXPRESSION Beware that many operators need to be escaped or quoted for shells. Comparisons are arithmetic if both ARGs are numbers, else lexicograph- ical. Pattern matches return the string matched between ( and ) or null; if ( and ) are not used, they return the number of characters matched or 0. Exit status is 0 if EXPRESSION is neither null nor 0, 1 if EXPRESSION is null or 0, 2 if EXPRESSION is syntactically invalid, and 3 if an error occurred. AUTHOR
Written by Mike Parker, James Youngman, and Paul Eggert. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report expr translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/expr> or available locally via: info '(coreutils) expr invocation' GNU coreutils 8.28 January 2018 EXPR(1)

Check Out this Related Man Page

bcfg2-reports(8)					      System Manager's Manual						  bcfg2-reports(8)

NAME
bcfg2-reports - Query reporting system for client status SYNOPSIS
bcfg2-reports [-v] DESCRIPTION
bcfg2-reports allows you to retrieve data from the database about clients, and the states of their current interactions. It also allows you to change the expired/unexpired states. The utility runs as a standalone application. It does, however, use the models from /src/lib/Server/Reports/reports/models.py. OPTIONS
-a Shows all hosts, including expired hosts. -b NAME Single-host mode - shows bad entries from the current interaction of NAME. NAME is the name of the entry. -c Shows only clean hosts. -d Shows only dirty hosts. -e NAME Single host mode - shows extra entries from the current interaction of NAME. NAME is the name of the entry. -h Shows help and usage info about bcfg2-reports. -m NAME Single-host mode - shows modified entries from the current interaction of NAME. NAME is the name of the entry. -s NAME Single host mode - shows bad, modified, and extra entries from the current interaction of NAME. NAME is the name of the entry. -x NAME Toggles expired/unexpired state of NAME. NAME is the name of the entry. --badentry=KIND,NAME Shows only hosts whose current interaction has bad entries in of KIND kind and NAME name; if a single argument ARG1 is given, then KIND,NAME pairs will be read from a file of name ARG1. KIND is the type of entry (Package, Path, Service, etc). NAME is the name of the entry. --extraentry=KIND,NAME Shows only hosts whose current interaction has extra entries in of KIND kind and NAME name; if a single argument ARG1 is given, then KIND,NAME pairs will be read from a file of name ARG1. KIND is the type of entry (Package, Path, Service, etc). NAME is the name of the entry. --fields=ARG1,ARG2,... Only displays the fields ARG1,ARG2,... (name, time, state, total, good, bad) --modifiedentry=KIND,NAME Shows only hosts whose current interaction has modified entries in of KIND kind and NAME name; if a single argument ARG1 is given, then KIND,NAME pairs will be read from a file of name ARG1. KIND is the type of entry (Package, Path, Service, etc). NAME is the name of the entry. --sort=ARG1,ARG2,... Sorts output on ARG1,ARG2,... (name, time, state, total, good, bad) --stale Shows hosts which haven't run in the last 24 hours SEE ALSO
bcfg2(1), bcfg2-server(8) BUGS
None currently known bcfg2-reports(8)