I'm trying to code the following WHILE loop in Bash:
While [string1 is non zero] and [string2 is non zero] and [counter < max]
Do
...
Done
I can't get the syntax right. I've tried:
Code:
while [ -n "$STRING1"] -a [ -n "$STRING2"] -a [$COUNTER -lt $MAX ]
But I get 'Too may arguments'
my issue is that the when i put in the correct input its going into the loop like i put in incorrect input and wont break out of the loop even with the correct input entered
Code:
import java.util.*;
import javax.swing.*;
[code]...
What's the difference between using > and >>? How can I use both < and > (redirection operators) in a single command?
View 2 Replies View RelatedI have a set of files to copy and decompress, and want to do these operations concurrently with a script.
Manually it would be something like:
Code:
The single & is intended to background the processes, while the && is intended to execute the gzip process if and only if the cp completes successfully.
My script is:
Code:
When I run it, bash gets angry with the following error:
Code:
So what is the proper syntax to accomplish this?
I have a requirement to check the following conditions..If my folders are not A and B then list files in the directory else no listing the filesso my if loop is some thing like this.
Code:
if [ $dirName = "C" && $dirName != "A" && != "B" ] then
ls -la
[code]....
I am a Novell (now defunct) CNE tring to learn Linux and am having a lot of trouble finding out where the WB 6-6 is wrong in the syntax for adding local4... the the syslog-ng config file. In the instructions there are discrepancies between commas and simi-comma, they are both in the statements in no particular order. there is no pattern to them. Here is what the book shows:
filter f_local4debug { level(debug) and facility(local4); };
When I try to input this in the Gnome terminal window to try and find out where it goes wrong I get the following: -bash: syntax error near unexpected token "(" If I can get the correct syntax I belive I can use the info to get past the rest of this portion of the lesson. I am desperate to learn Linux as the only jobs out there for a Novell CNE are migrations to MS, which really sucks, since MS really really sucks.
I need to be able to compare a file date with system date and delete files older than 30 days.
the file name is basically
error_log.03222011
of course the extension is the date the file was created.
Oh and before i get hammered I looked everywhere but am unable to make sense of what I found.
I have a bash script that is tracking ERROR connections (running in a cron every 15 minutes), sometimes the errors are true and are not connecting. But most of the time, the disconnects/reconnects are between 30 seconds are sending out false positives. I am looking for a time comparison code to pick out the 30 second disconnects and know that this is and "ok" error. Here is a section of the log with timestamps, errors, etc.
Tue 2010-06-01 22:01:30 ERROR [DataBufferSendService] 172.31.0.1:8016 caught exception: [NetworkAPI] Exception: [SocketStream] socket error
Tue 2010-06-01 22:01:32 ERROR [DataBufferSendService] 172.31.0.2:8016 caught exception: [NetworkAPI] Exception: [SocketStream] socket error
Tue 2010-06-01 22:02:00 INFO [Client] 172.31.0.1:8016 connecting to 172.31.0.1 on port 8016
Tue 2010-06-01 22:02:02 INFO [Client] 172.31.0.2:8016 connecting to 172.31.0.2 on port 8016
I pride myself on at least trying to help myself before I ask, but I've been staring at this a long time, I'm just not getting any traction.I've literally got 3 linux references on my desk right now that say that I should be able to use if conditionals, for example
[ -d FILE ]True if FILE exists and is a directory.
[ -e FILE ]True if FILE exists.
[ -f FILE ]True if FILE exists and is a regular file.
[code]....
This gives a selection menu where you choose an option, and it should continue. I have several of these as part of a much larger script, but something is wrong with this while loop.
Code:
VARIABLEINPUT="1"
if [ $VARIABLEINPUT == "1" ] ; then
echo -e "${YELLOW}How often would you like the automatic update and maintenance to occur after the installation?:
${RED}1)${WHITE} Hourly
${RED}2)${WHITE} Daily
${RED}3)${WHITE} Weekly
${RED}4)${WHITE} Monthly
"
[Code].....
A very simple loop that uses a variable from earlier in the script to adjust variables for later in the script. For some reason, this while loop will not end - I've noted where with echos.
I have a while loop in a file that looks like:
Code:
while IFS=":" read name script
do
su
exit
[code]....
Where I redirect the file into the loop, for some reason, I can't do an su when I redirect a file like that. I get the error, "su: must be run from a terminal." Why is this? How can I fix it?
I am setting some environmental variable in my .bashrc , the sample code I was provided with is for CSH but I am using bash, and there are some syntax differences between them ... I got most of the script to work, but I am getting an error at this part :
Code: if ($RMSTREE == $RMANTREE) then
set path=($path $RMANTREE/bin)
else
[code]...
In a bash script brought over from a Debian/Lenny system, Ubuntu 10.04 stumbles on the left parenthesis in the expression below:NEED_COLS=$[($HEX_WIDTH * 4) + 12]Is it an Ubuntu/Debian script style mismatch, or just post-Lenny? If that can be answered, is there a way to reconcile or syntax check older scripts?
View 2 Replies View RelatedI have bash 4.0. I used the following for loop example, but all it outputs is "{1..10} instead of the actual numbers one through ten. why?
Code:
for a in {1..10}
do
echo -n "$a "
done
I have a program I use, rrdtool. I need to modify a ds value on every file at the same time. However, using a wildcard (*) to try this operation of all files does not work and instead only updates one file.
Here is the command syntax:
rrdtool tune <file> --maximum traffic_in:100000000000 && rrdtool tune <file> --maximum traffic_out:100000000000
So, how can I do this on every file in the directory?
I'm new to scripting and I have a trouble with if statement syntax. The code is: Code: #there is a diff command here, and it does what i want but#i wanna see 1 if the exit value of diff is 0, and otherwise i wanna see 0.#the problem is here: (syntax error near unexpected token "then")
if["$?"==0];
then
echo 1
[code].....
I have this project which I've been working on essentially nonstop for the past three days and due to work I am running low on time. I'm new to Linux/Unix and my Teacher has assigned us a scripting project, due for Monday. I have All the functions for the project in a separate file which run as a daemon process when I log in. It has no syntax errors but my Script can not run the functions (I'm not sure where they go before or after the body) and I have one function I'd like you guys to take a look at. It has a Second menu leading to a case statement but it does not run after the Search. I'm Kinda tired of looking at the CLI but I have to finish this.
phoneEdi() {
directory=~/phonepro/directory
loop="y"
clear
tput cup 4 4; echo "Record Editor" .....
I'm scratching my head over a very simple netcat-based heartbeat monitoring script i wrote.
here we go:
Code:
echo `date --utc "+%Y-%m-%d %H:%M:%SZ"` script started
[code]...
I am trying to install vlc media player on my backtrack3 but when i am giving a command xvjf to extract bz2 file then
bash: syntax error near unexpected token `('
I'm starting to learn bash scripting and I can't figure out what's wrong with the following.
Code:
#!/bin/bash -x
ALFA=`kdesu "kdialog --getexistingdirectory ."`
echo $ALFA
I do not understand bash' syntax regarding the use of ((<arithmetic expression>)). $((<arithmetic expression>)) is tokenised to a single word. OK.
Code:
In isolation
Code:
It may not be used where a word is expected. This generates a syntax error. Why?
Code:
I am trying to make a bash menu that loops with options but it does not work as I want:
Code:
I want to make it read an option and do the action then return to menu.
What is the difference between For and While when creating loops in bash scripting?
View 1 Replies View RelatedI want to figure out what is going on in this small script.Its really strange.I think its the infinite loop again.All I want to do is to collect some data from the zenity dialog box in an array and then echo it.Here is the code
Code:
#!/bin/bash
#export PS4='+${BASH_SOURCE}:${LINENO}:${FUNCNAME[0]}: ' debugging info
[code]...
Totally new to programming (as of this morning) so please bear with me I have a bash script that stops working after the first while loop.
#part 1
While
doThisThatThe Otherdone
#part 2
While
doMOreMoreMoredone
Every arguement above the first loop completes (including the first loop itself) but anything below (incuding the second while loop) doesn't finish. I know that it isn't a problem with an unending loop... it seems to be something about the While loop that I'm not understanding... but I can't figure it out. I just need arguments below the first while loop to take place.
I have to format 4 years worth of awstats data "static" for a client and then move it to their new server.I don't want to run the commend to do this 48 times. If possible I would like to use a bash script that uses the folders in a directory so the script knows which year-month to do this for me and which folder to place the output in.
View 5 Replies View RelatedI ran across some odd behaviour using ssh in a bash script. I am hoping someone can explain it to me. I have a file called /home/user/hosts.
Code:
$ cat /home/user/hosts
host1
host2
host3
What I want (for this example anyway) is to run a script that checks this file and for each entry in this file it should log into that host and run a command. I have a script called testssh.sh.
Code:
$ cat /home/user/testssh.sh
#!/bin/bash -
somefile='/home/user/hosts'
[code].....
The oddity that wasted an hour of my day and the question I have for this group is, what is it about ssh that breaks the while loop? It obviously runs through once and checks the first host, just never checks any of the others. I checked exit status's and all kinds of verbose data and I could not figure it out.
I'm writing a mass snmp toner check which polls any toners available to be snmp polled, however when using a loop statement I get the results on different lines; which sounds good, however the tool I use to check with (nagios) ignores the new lines.
Is there any way I can get the output on one line? Also, I need to raise a fault if any of the toners are below a specific level (with nagios you raise faults with the exit code) - any way I can do this without exiting the loop. Code below with bits and bobs commented out.
Code:
check_ink_levels ()
{
for ID in $INKS
do
[Code].....
The script that Iam trying to write is running a for loop and reading line by line from a text file. inside this for loop i would like to execute update SQL statement .
a pesudo code is
Quote:
`$ISQL -U $username -P $Password -D $Dbname -I $INTERFACE <<QRY
for id in $idlist #idlist iam reading from a file
[code]...
I have a file like below:
PU12829,24869;PD15733,24869;PD15733,19785;PD12829,19785;PD12829,24869;
PU4599,20915;PD9924,20915;PD9924,18898;PD4599,18898;PD4599,20915;
PU12829,24869;PD15733,24869;PD15733,19785;PD12829,19785;PD12829,24869;
PU4599,20915;PD9924,20915;PD9924,18898;PD4599,18898;PD4599,20915;
PU1723,3423; #this line is ignored to short
[Code]...
What I'm trying to do is while true, cut each line from file that begins with PU and thats longer than 12 characters and write to a increasing numbered file for each line. Stating with object1 etc.