Hi Corona688/Scrutinizer,
Thanks for your reply. But i couldn't understand the reply fully.. apologies for that. I understood that I need to use ENDSSH at the beginning of the line, do you mean I need to use the label as given below..
I have configured ssh to a remote server without prompting for a password with the help of public keys...but now i am not able to execute any commands through a script
what i want is a one line script which takes me directly into /var directory after executing it...searched the entire forum but... (2 Replies)
Hi all,
In a shell script, how can I do the following:
Find out the size of a mounted usb stick (df -h /media/usbdisk) and use the
result (physical size of USB stick) to set a loop-counter according to the disk size??
As a result, I do copy files of 4MB each as many times as they will fit... (1 Reply)
Hi All,
How could I use telnet to connect to Primary Host in the below shell script:
Could I use:
(
echo user
sleep 2
echo password
sleep 2
echo "ls ~"
sleep 2
echo "exit"
) | telnet hostname
... (1 Reply)
i want use ssh on the host01 to execute autoexec.sh on the host02 like following :
host01> ssh host02 autoexec.sh
autoexec.sh include nohup command like follwing :
nohup /home/jack/deletedata.sh &
after i execute ssh host02 autoexec.sh one the host01. i can't found deletedata.sh... (1 Reply)
Hello,
I begin to write my first shell script, but I am totally lost, hope you can help me.
I'd like to write a script with some conditions and multiples usages:
./myscript.sh -i <host>
or
./myscript.sh -e <host>
Have you some suggestion, because I am really lost, I try to do something... (12 Replies)
Hi All,
I have a script which does report the cpu usuage, there are few output parameter/fields displayed from the script. My problem is I have monitor the output and decide
which cpu number (column 2) has maximum value (column 6).
Since the output is displayed/updated every seconds, it's very... (1 Reply)
hello all,
i have an AIX6.1 machine and INFORMIX 11.7 database server.
i have a script to create users on 3 machines and also i need to grant this user access to a specific database. the script works and it does what i want it to do but the loop doesnt work. for example if i insert 10 lines in... (5 Replies)
Hi,
A basic sed question.
I have a set of files. In each file there is a number that I want replaced. For example, if I run sed I should get the following:
% cat test2.txt
#goofy//171.00
goofy 171.00
% sed -i 's/171/xxx/g' test2.txt
% cat test2.txt
#goofy//xxx.00
goofy xxx.00
... (2 Replies)
I am trying to check multiple server's "uptime" in a loop over "ssh".
When I execute multiple ssh commands with hard coded servernames script is executing fine.
But when I pass server names using while loop, script is exiting after checking first server's status, why?
# serverList... (8 Replies)
Discussion started by: kchinnam
8 Replies
LEARN ABOUT PHP
expr
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)