General :: Nested Loop-bash Script - On Logic?

May 30, 2010

Am new in bash scripting, presently I have 2 files and i need to create a file reading from these 2 files. I was trying to work with 2 for loops, but I can see like once its executing 1st outer loop then all inner loop, then next outer loop+ all inner loop. How can i get result like 1 outer loop, 1 inner loop then 2 outer loop,2 inner loop etc. Below is my prog

rm d
for i in `cat a`
echo "dn:$i >> d
for j in `cat b`


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Ubuntu :: Accessing And Creating Files Names With Nested Loop In Bash?

Aug 12, 2011

nested loop in ''Bash-Scripting in Linux'' ?What's wrong with my code:

for x in `seq 0.75 0.01 0.95`
for y in `seq 0.20 0.01 0.40`


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Programming :: Nested Loop Using A Counter To Increment Array Output?

Feb 2, 2011

I work in a simulations environment. I'm trying to write a bash script that will read fields from a .csv file into an array, the first field being an identifiyng number and the second field being a corresponding url. There are about 1600 of these number/url combinations in the .csv file that i'm reading from. Once that is done i want it to parse a text file and match the number, when it has a match i want it to enter the corresponding url into a particular line in the text file. The script I have written (with the help of the people on this forum a while back) does this well, but now I have a lot more data to parse. I think the script itself is explanatory enough to see what i'm doing. What i would like to do is cut it down to one while loop nested inside another loop so that I don't have 1600 or so elif statements. I can't figure out how to increment the output of the array. for instance, the first cycle would find the number that matches ${record1[2]} and input the url stored in ${record1[3]}. the next cycle would match ${record1[4]} and input the url in ${record1[5]}, and so on, does that make sense? The code is below and a sample .csv and text file are attached.


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General :: Cd Dirname - Use The Output Of A Nested Bash Builtin Call

May 2, 2011

I'm trying to remember how to use the output of a nested Bash builtin call. So `which prog` gives me the path to the program, i'm interested in. Then I would like to get the directory path leading to that program and plug it into 'cd', so i end up in the directory containing the program.

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Programming :: [ Bash ] Count Nested HTML Tags?

Jan 7, 2011

I need to search through HTML files to count the number of <li> tags nested within the first <ul> tag:

<li>text 1</li>
<li>text 2</li>


Unfortunately, the second grep is greedy swallowing everything up to the last </ul> close tag. (The desired result is 2.) Speed is an issue as I will be searching through 350,000 files.

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General :: Bash For Loop Not Working?

Apr 21, 2010

I 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?

for a in {1..10}
echo -n "$a "

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General :: Bash Infinite Loop Haunting?

Mar 17, 2010

I 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

#export PS4='+${BASH_SOURCE}:${LINENO}:${FUNCNAME[0]}: ' debugging info


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General :: Bash Script - Stops After While Loop?

May 13, 2010

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
doThisThatThe Otherdone
#part 2

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.

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General :: Need For Loop To Get Dirs And Run Bash Script

Jul 7, 2010

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.

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Fedora :: Bash: While Loop Will Not End

Jan 9, 2010

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.

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

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.

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Security :: Bash: Can't Su Within While Loop

Jul 18, 2010

I have a while loop in a file that looks like:


while IFS=":" read name script


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?

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General :: For Loop Or While Loop To Read The Fields Of A File?

Sep 1, 2010

I have a mytext file with month and year as two separate fields. likemytext fil

08 2010
09 2010
10 2010

I want to read the values of each field i.e., month and year into an awk script.

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Ubuntu :: Bash Menu Option Loop

Mar 19, 2010

I am trying to make a bash menu that loops with options but it does not work as I want:


I want to make it read an option and do the action then return to menu.

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Ubuntu :: Loop Commands In Bash Scripting?

May 15, 2010

What is the difference between For and While when creating loops in bash scripting?

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Software :: Bash Script: Ssh Breaks While Loop?

Dec 6, 2010

I 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.

$ cat /home/user/hosts

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


$ cat /home/user/
#!/bin/bash -


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.

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Programming :: Bash For Loop - All Responses On One Line

Nov 18, 2010

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.

check_ink_levels ()
for ID in $INKS


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Programming :: Run SQL Update Statement In A For Loop In Bash?

Jun 7, 2010

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
`$ISQL -U $username -P $Password -D $Dbname -I $INTERFACE <<QRY
for id in $idlist #idlist iam reading from a file


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Programming :: Sed In A Bash Loop With Ascending Output?

Jan 1, 2011

I have a file like below:

PU1723,3423; #this line is ignored to short


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.

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Programming :: Using A Variable To Control A BASH For Loop

Jul 3, 2009

I know of 4 different ways to use a for loop:

1. for I in {1..10}; do echo $I; done|

2. for I in 1 2 3 4 5 6 7 8 9 10; do echo $I; done|

3. for I in $(seq 1 10); do echo $I; done|

4. for ((I=1; I <= 10 ; I++)); do echo $I; done

I have a script which uses the 1st form of for loop. I'm trying to modify it to use a variable instead of a static hard-coded value in the section that controls the looping.of the for loop.

I've tried all different ways of quoting and escaping the variable, and the problem is that the quoting chars and escape char are being translated and passed into the loop along with the value stored in the variable.

For example, to change the start value of 1 to whatever value I want passed in through a variable:


I have tried: {{$a}..10} and {`$a`..10}, to have the variable evaluated first.

I have tried using the eval() function.

I have tried single and double quotes and the backslash escape character.

Nothing I've tried works. It's probably a syntax error.

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General :: Free Up An LVM Logic Volumn Into A Physical Partition?

May 13, 2010

In my computer there is only one hard disk with two partitions. /dev/sda1 is mounted as /boot, while /dev/sda2 is used as LVM. In that LVM partition I have only one logic volumn group with several logic volumns. One of the logic volumns is mounted as /data, and now I want to remove this logic volumn, free up the space and make it another physical partition outside LVM as /dev/sda3. Can someone help me on this, especially the procedure of steps I should go through ?

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Ubuntu :: Bash Script - For Loop - Replacing Strings?

Aug 16, 2011

I'm not overly great with bash scripting. I do more batch file stuff for Windows than anything else but I'm trying to branch out a bit. (Frankly, I'd love to do this in Ruby but I'm not there yet...) Maybe I'm not using the correct terminology and that's why my searches are coming up useless...

Anyway, I have a script that does some work with HandBrake. Although it deals with HandBrake, I think the issue is not with HandBrake itself. The issue: I had a simpler script which worked fine but it would give me an MP4 with a file name of: Some Movie Name.iso.mp4 and it would still play but I wanted to get rid of the .iso in the file name. I also wanted to drop it into another directory during the encoding. That's why you see a $source & a $destination variable.


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Server :: Bash Mayhem With For Loop And Variable Range

Mar 1, 2011

As you can see on the output of the script, the two 'testing echoes' I do at the end don't print anything.That's the point, I do NEED this array further in my script.I'd understand my "param" var is local to the for, but is the other one too ? I tried to use "declare -a file" before the for, but i get same exact result !

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Programming :: BASH : Using A Loop To Download A Series Of Files?

Feb 2, 2010

Never mind, I figured it out myself. Firstly, the old version of BASH I'm using doesn't support


for i in {1..27}

So I had to use


for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27

Secondly, it was simply


for i in 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27


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Programming :: Bash Script That Reads Lines In While Loop

May 26, 2011

So I need to write a bash script that can read lines and column 3 from a file. It needs to start on line 16 and read every 20th line starting from there. But the value that it reads needs to be checked, should it be too great I need it to shut the program down.I'm pretty new to bash, but my ultimate goal is being able to safely run a program on a GPU for an extended period of time with out worrying about it overheating. I have a command that outputs information from the GPU every second, and I can save this to a file. So all I really need is something to read and check that file, I played around a bit with the awk command and can't get it to work within my for loop with dynamic variable.

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Programming :: Bash To Loop Through Mysql Select Array?

May 26, 2011

I need to know how to assign a result from a select. I am clueless on the sytax. I am trying this in bash. Maybe I am not assigning the array right. It gives me the whole row in the echo instead of just field a. How do I get fieldA = a in the select. Note script was stripped for security on database info but the syntax is same.


results="$(mysql --user ${DB_USER} -p${DB_PWD} ${DB_NAME} -Bse 'select a,b,c,d from tblMytable')"
for rows in "${results[@]}"
echo ${fieldA};

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Software :: Bash Syntax - While Loop With Multiple Comparison Operators

Apr 21, 2009

I'm trying to code the following WHILE loop in Bash:
While [string1 is non zero] and [string2 is non zero] and [counter < max]

I can't get the syntax right. I've tried:
while [ -n "$STRING1"] -a [ -n "$STRING2"] -a [$COUNTER -lt $MAX ]
But I get 'Too may arguments'

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Programming :: Bash Step Incremental Loop To Stop On Each Increment?

Jul 17, 2011

How do I get this loop to stop on each increment? This script does work but I would like it to stop at each increment, remember what the value of $n is, then continue until it gets to 7. I have worked so hard on this. My brain is hurting now.


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Programming :: Bash Variable Parsing / Extract And Put Into Variables Each Combination Of F1 And F2 In A Loop?

Oct 14, 2010

I have a bash variable where the content looks like this where ;f1; and ;f2; are delimiters:
;f1;field1value1;f2;field2 value1 ;f1;field1value2;f2;field2 value2 ;f1;field1value3;f2;field2 value3

So what I need is to extract and put into variables each combination of f1 and f2 in a loop to something like that:

#first pass of the loop I need:
f2=field2 value1

#second pass of the loop I need:
f2=field2 value2

# third pass of the loop I need:
f2=field2 value3

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General :: Mutt Nested Mailboxes Navigation Possible?

Feb 18, 2010

I receive a lot of emails daily, and with the ever-growing amount of maildirs I'm in need to structure/optimize the browsing in mutt. My maildirs follow this naming scheme: .domain.category.sub_category

My goal is to break domain, category and sub_category into nested levels when browsing through the mailboxes. This is sort of achieved through the use of imap. But I stumble upon a few snags, so my questions are:

Is this nested mailboxes view possible by directly accessing ~/Mail and not using IMAP?
E.g. set folder="~/Mail" and set spoolfile="~/Mail/.INBOX"
When I start mutt I'm presented with all mailboxes available, which is what I want to get away from. I want to get directed directly into my default/main inbox like I do when accessing ~/Mail directly. How?

When hitting c (a defined macro, see configuration below) I again get presented with all the mailboxes available, and not the mailboxes at the current browsing level, e.g. mailboxes containing a specific category. To get this view I need to hit c+TAB. I've solved this by adding a <tab> to the c macro's. When finally getting mutt to present me mailboxes in nested levels they are only enumerated and not annotated with N, indicating new mail, or even better, total number of new mails in or under a folder. I know it's possible to define format on the different views, but is there one for this view? If so, which?

My mutt configuration:
set autoedit
set edit_headers
set reverse_name
set from='blapp'
set realname='Blapp'
set use_from .....

# Automatic viewing of html mail, but always prefer text/plain
set implicit_autoview
alternative_order text/plain text/html

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General :: List Of All Nested Subfolders With A Specific Name?

Jun 3, 2010

How to get a list of all the subfolders with a specific name
e.g. all the folders which their name contains 'NAME' code...

but this won't give me a unique list (if the folder has subfolders it gets listed multiple times)

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