Questions about shell scripts, executable files that are interpreted by a shell (bash, zsh, etc.).

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0
votes
3answers
162 views

How to delete number of lines from file repetitively

I've read How do I delete the first n lines of an ascii file using shell commands?, it is helpful. However I've a file something as below (please consider 2 columns as 2 different files): 1 4 1 4 1 4 ...
3
votes
1answer
261 views

Pausing rsync via bash script?

Is there a way to pause rsync via command line, if it transfers data for over X minutes? I'm working on using it as a backup and would like it to pause every once in a while to prevent the hard disks ...
3
votes
5answers
1k views

Remove lines based on pattern by keeping first n lines

I need to remove lines from a text file based on pattern but I need to keep the first n lines of that pattern. Input % 1 % 2 % 3 % 4 % 5 text1 text2 text3 output %1 %2 text1 text2 text3 I used ...
0
votes
1answer
230 views

How do I write a script to keep retrying Yum Update Program?

My job let me always release a new version of the program to a satellite server, then in the running server, I use yum update program to update the program. However, due to unknown reason, in most of ...
2
votes
2answers
2k views

how to move (not copy) files from one server to another?

I want to move files from server1 to server2. A producer on server1 will keep generating the files, and a consumer on server2 will keep processing them. I can copy files using the following shell ...
3
votes
2answers
268 views

Make copies of a single directory to multiple directories with different names

I'm trying to replicate a single directory (with sub-directories) to a bunch of new directories based on a list. For example I can: mkdir Fred Barney Thelma Louise Foo Bar How would I copy a premade ...
0
votes
1answer
952 views

Shell script to delete all files which are older [duplicate]

Possible Duplicate: Deleting files by age Write a shell script to delete all the files which are "n" of older that current day, where n can be 3days. 2days, or 1 year etc. The above script ...
3
votes
1answer
610 views

Need to improve urlencode function

I need a way to URL encode strings with a shell script on a OpenWRT device running old version of busybox. Right now I ended up with the following code: urlencode() { echo "$@" | awk -v ORS="" '{ ...
1
vote
1answer
799 views

Identify text/ascii files in Linux/Solaris

I have a little project to build bash script that search in the OS ( Linux/Solaris ) the current IP address from files and replace them with other IP address. The problem is that IP address could be ...
4
votes
3answers
5k views

Concatenate multiple files with same header

I have multiple files with the same header and different vectors below that. I need to concatenate all of them but I want only the header of first file to be concatenated and I don't want other ...
0
votes
2answers
166 views

file command + how to view all results from file command

I use the file command in order to verify if file (PATH) is text/ascii file or encrypted file Because file command have allot of results ( small example in example 1 ) I want to get the all ...
3
votes
3answers
210 views

Zsh function with su and echo

I'm trying to add a function to my .zshrc that makes adding new USE flags to my /etc/portage/package.use file easier. Normally, I'd have to do su -c 'echo "net-misc/aria2 bash-completion bittorrent" ...
1
vote
1answer
258 views

Environment auto-install script

When I work, I often have to switch computers or virtual machines which means that every time I switch, I have to set up my (Linux) environment again. Is there a tool (in contrast to a simple bash ...
1
vote
1answer
403 views

Convert discus output into readable HTML mail

How can I take the DISCUS command output below: and convert it into something HTML email friendly? I've bash scripted something like this: #!/bin/sh discus > /tmp/discus.log touch ...
5
votes
5answers
9k views

gpg asks for password even with --passphrase

I expect the following command to extract the gpg file without asking for password: gpg --passphrase 1234 file.gpg But it asks for the password. Why? This also have the same behavior: gpg ...
1
vote
3answers
577 views

linux/solaris + verify duplicate valid IP address from file

what the best way to find duplicate IP from file ( I have ksh script in this script I need to write function that check for duplicate IP ) for example if IP - 192.1926.23.52 exists twice in file - ...
0
votes
4answers
4k views

/shell-script: syntax error near unexpected token `done'

I am getting syntax error near unexpected token done while executing my shell script: while read filename do echo "$filename" if [ -s $filename ]; then tail -10 $filename | grep `date ...
4
votes
2answers
2k views

sed: multi-line replace of config block

I have some configuration files that basically look like (...content...) # BEGIN DYNAMIC BLOCK - DO NOT EDIT MANUALLY (... more content ...) # END DYNAMIC BLOCK (... even more content ...) Now, in ...
0
votes
3answers
2k views

How to match a file name suffix

How to verify if the name of a .xml file name ended with .any-string? e.g. .previous or .backup or bck12 etc ... I need to print the XML file name except for XML files that end with ...
3
votes
1answer
434 views

Color script output only when invoked from interactive shell

I made a bash script producing colored output. The colors are fine when the script is called from an interactive shell. However, if the output is processed in another script, or passed through a pipe, ...
6
votes
4answers
2k views

Tool to create text files from a template

I have to regularly create 100+ text files from templates. I currently use an overly complicated shell script. I think there is a smarter way to handle this, but I don't know how. I have a "database" ...
3
votes
1answer
1k views

Capture screen content for error parsing

I am a database administrator working with DB2 on AIX. (Please continue to read as this is related more to ksh than DB2, otherwise I would have posted this over on dba.stackexchange.com.) I am ...
3
votes
2answers
842 views

Error when subtracting two negative numbers in ksh: “assignment requires lvalue”

I am trying to debug someone else's script: The code line is: y=$((${oldvalue[$x]}-${newvalue[$x]})) y gets calculated fine as long as both sides are positive numbers. However, I have a ...
5
votes
2answers
2k views

How to continuously take backup of log files?

I have some applications in Lunux which creates Log files of around 41 MB each. The log files switches from log.1 to log.2 and starts overwriting log.2 once this 41MB is completed in log.1 file. I ...
3
votes
4answers
2k views

bash string extraction

I would like to extract the 2nd field from the last part of the following strings: foo_1.103.debug_xx.ver21-inc-1 --> string extracted "debug_xx" foo_1.103.1.0.release_32_xx.ver21-inc-1 ...
2
votes
1answer
2k views

Bash variable in Awk script

I have this flat file database(ff_servers.db) with following contents: 192.168.154.2 Alaska hp 192.168.157.3 Colorado dell 192.168.156.3 hawaii hp From command line, I could run: awk ...
3
votes
2answers
652 views

Shell script debugging

I was wondering if there is an IDE that would allow me to define an ssh connection to a remote host, connect, and locally debug a script running remotely (kind of like you can debug a remote Java app ...
2
votes
1answer
79 views

Listing script's file dependencies

Given a shell script, is there an easy way to extract what files it manipulates explicitly (so not like concatenating some command and than eval-ing it)? E.g. #!/bin/bash . /etc/someconfig.cfg ...
7
votes
1answer
871 views

what is the zsh equivalent of bash's export -f

So I started using zsh. I like it all right. It seems very cool and slick, and the fact that the current working directory and actual command line are on different lines is nice, but at the same time, ...
6
votes
4answers
4k views

Preserve directory structure when moving files using find

I have created the following script that move old days files as defined from source directory to destination directory. It is working perfectly. #!/bin/bash echo "Enter Your Source Directory" read ...
2
votes
2answers
163 views

Does a parent bash script remember the cd history from a child bash script?

Example: mainscript.sh cd /mnt/something ./buildscripts/000-script.sh 000-script.sh cd /mnt/otherthing mkdir something exit
-1
votes
1answer
149 views

Error while running bash script that moves files

I am new to bash script and want to create bash script that moves some days old files between source and destination as per days defined in script. When I run this script I get error find: paths ...
0
votes
1answer
129 views

Why is this variable not getting passed to awk? [duplicate]

Possible Duplicate: external variable in awk How do I pass this variable below? This doesn't work: fname=testfile.txt lsof | awk '/deleted/&&/$fname/ {print $4}' *----no output* ...
0
votes
2answers
289 views

Shell script that copies while adding a user-provided filename suffix

I'm trying to write a shell script on Solaris that copies files from one directory to another. I need it to prompt the user for a date, and add that as a suffix to the destination filenames. How do I ...
2
votes
1answer
163 views

How to set Cols and Lines for a Subprocess

I have a script that runs a series of scripts numbered 001,002,003,004... etc down to 041 right now, will be more in the future - and these scripts them selves use some cursor control to print a ...
3
votes
3answers
135 views

SSH to two addresses, use the one that connects first

I have a home computer (let’s call it franklin because that’s what I call it) that I often ssh into from my work laptop. When I’m at home, I ssh to franklin.local, and when I’m at work or anywhere ...
0
votes
1answer
465 views

difficalty to save traceroute output in shell variable?

I need to filter and store traceroute output in shell variable (array). But I am getting some unusual output. As I try to explain in following lines. My present directory is temp, having some ...
2
votes
2answers
998 views

print a file in hex using awk

I have a file name x $ cat x 1A34532112345 I wants to print in hex using awk I written a script (with help from web) fold -1 /home/cscape/Desktop/x | gawk '{ printf("%s , %X\n",$0, int($0) )}' ...
2
votes
3answers
208 views

Indent like first line

How can I indent a file such as its first line? Example: A file containing x=1+2+3+4+ 5+6+7+8 +9+10+12 should be converted to x=1+2+3+4+ 5+6+7+8 +9+10+12 I need this inside ...
5
votes
1answer
1k views

Find all folders in a directory with the same content

In Ubuntu, is there any to find duplicate folders in a directory (i. e., folders with the same content)? I think there are already some command-line tools available for finding duplicate files (such ...
1
vote
2answers
115 views

Extra % in output of awk script

I have the following script in awk that sums all columns in a file that I pipe to it: #sum_all.awk { for (i=1; i<=NF; i++) { sum[i]+= $i } } END { for (i=1; i<=NF; i++ ) { printf "%d ", ...
6
votes
3answers
4k views

Is there a way to call a command with a set time limit and kill it when that time passes? [duplicate]

Possible Duplicate: Run a command for a specified time and then abort if time exceeds I was working on a continuos integration build script when a need for such a command arose. Basically ...
0
votes
1answer
97 views

why there is random behaviuor for a background job?

going through advanced bash scripting guide example 3.3 running a loop in background, i found this : #!/bin/bash # background-loop.sh for i in 1 2 3 4 5 6 7 8 9 10 # First loop. do echo -n "$i " done ...
0
votes
1answer
338 views

How to make a scheduled task based on a file creation time?

The supercomputer I run my Analysis uses SGE to do the job management and requires each job duration not longer than 24 hours. And this feature is causing me quite a headache. Sadly, I was asked to ...
1
vote
1answer
613 views

Linux + replace STRING/WORD in file according to rule

My target is to replace any word/string/Any characters in file with new word/string according to the following rules: If numeric characters on the left side of word/string then we not replace the ...
0
votes
1answer
417 views

linux + perl + replace any WORD in file with special characters with condition

Example1 work fine when I want to replace OLD_TEXT with NEW_TEXT ( its replace also all special characters as $@^%)(_+`:; etc ..) example1 export OLD_TEXT='$$OLD_WORD$$' export ...
3
votes
3answers
2k views

In Unix speak what is the difference between a shell script and an executable?

I have seen this question on this site and this prompted me to ask this question . I want to know in Unix speak what is the difference between an executable and a shell script ?
0
votes
1answer
2k views

What is the fastest way to process line by line in bash? [duplicate]

Possible Duplicate: How to loop over the lines of a file? Let's say I cat a file and I want to run a bash command on each line and write each line as output. How can I run a bash command ...
3
votes
3answers
8k views

How to take 'password' like input in shell script? [duplicate]

Possible Duplicate: How to hide commands typed in a Linux shell? Reading passwords without showing on screen in Bash Scripts I would like to take a password as input, but I want user to ...
11
votes
4answers
4k views

Is there a JavaScript shell?

Recently I've been working with JS and I'm very enthusiastic about this language. I know that there is node.js for running JS at server side, but is there a shell that uses JS as a scripting language? ...