10-19-2001
use of back tics
Did you understand the use of back tics?
You can capture the output of a command or series of commands to a variable to use in a script.
Here is an example.
USERS=`who|wc -l` Saves the output to the variable "USERS". in a script you would put this above your code.
You could write.
#!/bin/sh
USERS=`wc|who -l`
If $USERS -lt 10; then frizzle; fi
This usually works best with an output that is numeric so you can compare it to something.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi there - am newish to shell scripting and would appreciate some advice on this...
Am trying to use what I have seen called 'compound variables' in other langs but with no success in my shell script. This is the kind of thing I'm trying to do:
base_val=123
stop=3
x=1
while
do
... (3 Replies)
Discussion started by: neemic
3 Replies
2. Shell Programming and Scripting
Erase the space in assigment operator.
array_var=`expr $base_val + $x` (1 Reply)
Discussion started by: irina
1 Replies
3. Shell Programming and Scripting
I'm trying to write a script using the 'find' command and it's -exec option to run a compound command against the files found.
Example:
find . -name "*.conf" -exec cat {} | grep "#" > /tmp/comments.list \;
Of course the above doesn't work. So I experimented for a bit to see if there was... (6 Replies)
Discussion started by: deckard
6 Replies
4. Shell Programming and Scripting
how can i use two or multiple statements in the if part
of an awk code
for example
i want to check two flag if they are true i will write some print
operations and increase the counter.
here is the c version of the code that i want to write:
counter=0;
if (flag1==1 && flag2==0) {... (7 Replies)
Discussion started by: gfhgfnhhn
7 Replies
5. Shell Programming and Scripting
in a text " Korn Shell Unix programming Manual 3° Edition"
i have found this sintax to declare a compoud variable:
variable=(
fild1 (0 Replies)
Discussion started by: ZINGARO
0 Replies
6. Shell Programming and Scripting
in a text " Korn Shell Unix programming Manual 3° Edition"
i have found this sintax to declare a compoud variable:
variable=(
fild1
fild1
)
but this sintax in ksh and sh (HP-UNIX) not work...
why?? exist another solution for this type of variable ??? (5 Replies)
Discussion started by: ZINGARO
5 Replies
7. Programming
I had seen this error for the first time .....
error: initializer expression list treated as compound expression
please help.... (12 Replies)
Discussion started by: arunchaudhary19
12 Replies
8. Shell Programming and Scripting
I am writing a Bash script that will either clone a database or setup a standby database. So Parameter 2 will be the operation type. If the value is not clone or standby I want to throw an error message. I suppose I can also do a case block. So far i have been unable to get the syntax working... (1 Reply)
Discussion started by: gandolf989
1 Replies
9. Programming
Can anyone explain for me why this does not work in tcl:
if !{( $a > "" || $b > "" )} { .......
where a and b are string vars.
and this works instead:
if {!( $a > "" || $b > "" )} { ........
Thanks. (6 Replies)
Discussion started by: gio001
6 Replies
10. Shell Programming and Scripting
Hello,
Here is my problem using KSH
I have a set of compound variables, let say cmp_var1 cmp_var2
The names of these variables are stored in an indexed array.
How can I access the subfields of these compound variables ?
I tried:
set -A cmp_varnames=(cmp_var1 cmp_var2)
for cmp in... (4 Replies)
Discussion started by: luky55
4 Replies
LEARN ABOUT PHP
upsd.users
UPSD.USERS(5) NUT Manual UPSD.USERS(5)
NAME
upsd.users - Administrative user definitions for NUT upsd
DESCRIPTION
Administrative commands such as setting variables and the instant commands are powerful, and access to them needs to be restricted. This
file defines who may access them, and what is available.
Each user gets its own section. The fields in that section set the parameters associated with that user's privileges. The section begins
with the name of the user in brackets, and continues until the next user name in brackets or EOF. These users are independent of
/etc/passwd.
Here are some examples to get you started:
[admin]
password = mypass
actions = set
actions = fsd
instcmds = all
[pfy]
password = duh
instcmds = test.panel.start
instcmds = test.panel.stop
[monmaster]
password = blah
upsmon master
[monslave]
password = abcd
upsmon slave
FIELDS
password
Set the password for this user.
actions
Allow the user to do certain things with upsd. To specify multiple actions, use multiple instances of the actions field. Valid actions
are:
SET
change the value of certain variables in the UPS
FSD
set the forced shutdown flag in the UPS. This is equivalent to an "on battery + low battery" situation for the purposes of
monitoring.
The list of actions is expected to grow in the future.
instcmds
Let a user initiate specific instant commands. Use "ALL" to grant all commands automatically. To specify multiple commands, use
multiple instances of the instcmds field. For the full list of what your UPS supports, use "upscmd -l".
The cmdvartab file supplied with the distribution contains a list of most of the known command names.
upsmon
Add the necessary actions for a upsmon process to work. This is either set to "master" or "slave".
Do not attempt to assign actions to upsmon by hand, as you may miss something important. This method of designating a "upsmon user" was
created so internal capabilities could be changed later on without breaking existing installations.
SEE ALSO
upsd(8), upsd.conf(5)
INTERNET RESOURCES
The NUT (Network UPS Tools) home page: http://www.networkupstools.org/
Network UPS Tools 05/25/2012 UPSD.USERS(5)