Sponsored Content
Top Forums UNIX for Dummies Questions & Answers Basic sed usage in shell script Post 302913871 by Corona688 on Wednesday 20th of August 2014 11:00:51 AM
Old 08-20-2014
Variables do not expand in single quotes.

Code:
# VAR=asdf
# echo '$VAR'

$VAR

# echo "$VAR"

asdf

#

This User Gave Thanks to Corona688 For This Post:
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

need a quick basic shell script help

im trying to run the below if command ifconfig -a |grep 10.100.120.21 gives me below output inet addr:10.100.120.21 Bcast:10.100.120.255 Mask:255.255.255.0 i just want a basic shell which says if above exists then continue how would i do this? (6 Replies)
Discussion started by: eb222
6 Replies

2. Shell Programming and Scripting

Basic Shell script syntax help

Hi All, I am new to shell scripting. I have a variable which holds a numeric value.I have to check whether this variable holds a value between(0- 8),(8-17)(17-24).How do i write this syntax using if in shell scripting. Thanks Vignesh (2 Replies)
Discussion started by: vignesh53
2 Replies

3. Shell Programming and Scripting

usage...sed/awk/reg-exp ..in shell scripting

in shell scripting there is extensive usage of i> regular expression ii>sed iii>awk can anyone tell me the suitable contexts ...i mean which one is suitable for what kind of operation. like the reg-exp and sed seems to be doing the same job..i.e pattern matching (1 Reply)
Discussion started by: mobydick
1 Replies

4. Shell Programming and Scripting

shell script basic doubt

hi, I am new script learner, so my basic doubt is , how to store value of any command in a variable example $ ls | wc -l i want to stote the output of this in a variable c. so that i can use c in if else loop. and when do we use " ` " symbol in script.. can anyone also tell for... (5 Replies)
Discussion started by: hi2_t
5 Replies

5. Shell Programming and Scripting

Basic Shell Script Help

Lets say I wanted to create a script that would show what people are doing on my machine using the w command and refresh in about 6 seconds. What would be the easiest way to do this? I pretty much want the script to loop until I stop it. I'm using the BASH shell by the way. Help is appreciated.... (1 Reply)
Discussion started by: c4391
1 Replies

6. Shell Programming and Scripting

Basic shell script help

Im trying to make a script that simply adds a word to the last available line in a txt file without overwriting any previous lines. Ive googled this and there are great examples but no one explain what each function does, and i dont entirely understand how it works. Basically Im looking for... (7 Replies)
Discussion started by: kylecn
7 Replies

7. Shell Programming and Scripting

Help! Basic shell script advice

##### (2 Replies)
Discussion started by: AidoPotato
2 Replies

8. Shell Programming and Scripting

Need a little help with my first shell script. Basic image resize script...

Hey everyone, just now joined because I didn't want to go onto Ubuntu forums and start asking about how to write shell scripts. Seems like this is a pretty active forum for exactly what I need. I'm trying to modify a shell script I found online, the end goal is to have it find all files in the... (9 Replies)
Discussion started by: mozzles
9 Replies

9. Shell Programming and Scripting

Basic Combination Shell Script

I need to have a script read a file that has a list of words in a single column like below:Black Blue Brown Orange Red Yellow Green White Purple Silver Grey Tan Then print to another file just all of the two-word possible combinations. Example: Black,Blue Anyone want to take a... (4 Replies)
Discussion started by: vespasian
4 Replies

10. Shell Programming and Scripting

Basic Shell script - Not working

Hello, This is basic (i think). I am trying to run a shell script which would go into each folder (folder names defined in the list) and after entering would run some commands, once done, come out of the folder and continue until the list ends. Pretty basic and there are bunch of example online. ... (9 Replies)
Discussion started by: Zam_1234
9 Replies
UPSLOG(8)							    NUT Manual								 UPSLOG(8)

NAME
upslog - UPS status logger SYNOPSIS
upslog -h upslog [OPTIONS] DESCRIPTION
upslog is a daemon that will poll a UPS at periodic intervals, fetch the variables that interest you, format them, and write them to a file. The default format string includes variables that are supported by many common UPS models. See the description below to make your own. OPTIONS
-h Display the help message. -f format Monitor the UPS using this format string. Be sure to enclose format in quotes so your shell doesn't split it up. Valid escapes within this string are: %% Insert a single "%" %TIME format% Insert the time with strftime formatting %ETIME% Insert the number of seconds, ala time_t. This is now a 10 digit number. %HOST% insert the local hostname %UPSHOST% insert the host of the UPS being monitored %PID% insert the pid of upslog %VAR varname% insert the value of variable varname The default format string is: %TIME @Y@m@d @H@M@S% %VAR battery.charge% %VAR input.voltage% %VAR ups.load% [%VAR ups.status%] %VAR ups.temperature% %VAR input.frequency% -i interval Wait this many seconds between polls. This defaults to 30 seconds. If you require tighter timing, you should write your own logger using the upsclient(3) library. -l logfile Store the results in this file. You can use "-" for stdout, but upslog will remain in the foreground. -s ups Monitor this UPS. The format for this option is upsname[@hostname[:port]]. The default hostname is "localhost". -u username If started as root, upsmon will setuid(2) to the user id associated with username for security. If username is not defined, it will use the value that was compiled into the program. This defaults to "nobody", which is less than ideal. SERVICE DELAYS
The interval value is merely the number given to sleep(3) after running through the format string. Therefore, a query will actually take slightly longer than the interval, depending on the speed of your system. LOG ROTATION
upslog writes its PID to upslog.pid, and will reopen the log file if you send it a SIGHUP. This allows it to keep running when the log is rotated by an external program. SEE ALSO
Server: upsd(8) Clients: upsc(8), upscmd(8), upsrw(8), upsmon(8) Internet resources: The NUT (Network UPS Tools) home page: http://www.networkupstools.org/ Network UPS Tools 05/21/2012 UPSLOG(8)
All times are GMT -4. The time now is 05:33 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy