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

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2
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2answers
1k 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
214 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
118 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
5k 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
98 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
375 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
683 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
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1answer
433 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 ...
4
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 ...
4
votes
3answers
9k 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 ...
12
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? ...
2
votes
2answers
1k views

Regex for phrase matching with case statement in ksh

I am trying to start or stop a service on AIX in ksh. I am trying to start to build in fool proofing for checking things like if the services is already down, etc. Here is my script #!/bin/ksh ...
3
votes
2answers
152 views

POSIX test and -a

I checked a script of mine with checkbashisms and I got the following warnings: possible bashism in check_ssl_cert line 821 (test -a/-o): if [ -n "${ALTNAMES}" -a -n "${COMMON_NAME}" ] ; then In ...
0
votes
1answer
153 views

linux/solaris + manipulation of Standard Output

I run the following line on linux/solaris machine ( all output will write in to /tmp/Log from application.bin ) ./application.bin 1>>/tmp/Log We can see the content of the /tmp/Log file ...
5
votes
4answers
5k views

How can I assign an initial/default password to a user in Linux?

I found a guide that explains how to set a user's password. I'm trying to automate it and send an e-mail to the user like: userid created with password XYZ. request to change the initial password. ...
1
vote
1answer
1k views

connect to a remote server through ssh [duplicate]

Possible Duplicate: How do I execute a remote shell script over SSH and be prompted for passwords by commands that require it in that script? I want to connect to a remote server through ...
3
votes
3answers
553 views

Script matching literal pattern over multiple lines?

I have a multi-line string in the variable $PAT. $PAT must be searched for within the file $FILE. If $PAT is in $FILE, it needs to print the file with $PAT removed. If $PAT is not found, then print ...
2
votes
1answer
186 views

Difference between 3 commands which are used to execute shell script? [duplicate]

Possible Duplicate: Different ways to execute a shell script What are the specific differences between the commands listed below? ./<scriptname> . <scriptname> bash ...
3
votes
2answers
1k views

Why can't I kill a timeout called from a Bash script with a keystroke?

[Edit: This looks similar to some other questions asking how to kill all spawned processes – the answers all seem to be to use pkill. So the core of my question may be: Is there a way to propagate ...
5
votes
4answers
16k views

Appending current date to filename

I'm trying to append the current date to the end of a file name like this: TheFile.log.2012-02-11 Here is what I have so far: set today = 'date +%Y' mkdir -p The_Logs & find . -name The_Logs ...
1
vote
2answers
10k views

Shell script to increment count of entries

I want a script which increments the count when the script runs. Basically I want to send an email notification when I find 10 devices down from the same country and scripts run after every down ...
-1
votes
1answer
120 views

Counters in shell

I am looking for a shell script where counter needs to be set for input paramter and do action once the count reaches to 5. The problem is there could be n number of input parameter and action should ...
1
vote
2answers
816 views

bash scripting - Any function to escape character?

I am trying to automate some of my stuff and facing a issue, the problem boils down to escaping the value that is being passed as a argument to the script. myScript.sh #!/bin/bash loadPatch -name ...
2
votes
1answer
498 views

Can i update my commands( like awk,sed) to the latest release in solaris?

bash-3.00# awk '{print NR}' f1.txt 1 2 3 4 but FNR does not print anything. awk '{print FNR}' f1.txt the above line does not gives me any output,seems that the awk that i am having in my ...
17
votes
3answers
784 views

What is the difference between [[ $a == z* ]] and [ $a == z* ]?

Is there is any difference between these two. [[ $a == z* ]] and [ $a == z* ] Can I have an example where they would have different outputs? Furthermore, how does the working of [[ ]] differs ...
1
vote
1answer
277 views

Linux + Solaris how to verify the last execute process from list of process

I need advice: How to verify which is the last scan_sys.sh process that run in my linux or solaris ? my target is to kill all scan_sys.sh process , except the latest scan_sys.sh ( the last execute ...
4
votes
3answers
3k views

Diff, show modified line from right file only

I have file a and b and I would like to output lines of b that changed since it was cloned from a. Just the modified lines, no surrounding context, no diff offset marks. How can I do that using shell ...
1
vote
3answers
3k views

Print lines where first field has only four characters using regex in awk?

John Goldenrod:(916) 348-4278:250:100:175 Chet Main:(510) 548-5258:50:95:135 Tom Savage:(408) 926-3456:250:168:200 Elizabeth Stachelin:(916) 440-1763:175:75:300 output should contain the lines ...
8
votes
5answers
36k views

How can I monitor all outgoing requests/connections from my machine?

My machine is a server so I want to ignore connections being made to my server (e.g. when someone visits my website). I want to see only connections/requests being made by my server to other places. ...
5
votes
1answer
318 views

Batch conversion of Module files with XMP

I have the following script to convert a big bunch of .MOD and .XM files into Wave format: #!/bin/bash for f in ./XM.* ./MOD.* do xmp $f -d wav -o - | ffmpeg -i - -acodec libmp3lame -ab 320k ...
2
votes
3answers
435 views

Remove Linux shell script stuck

This script should remove the contents of the dustbin directory. If the -a option is used the script should remove all files from the dustbin. Otherwise, the script should display the filenames in ...
5
votes
1answer
2k views

Global /etc/profile setenv or export overwriting user settings in .profile

I need to call a modified version of a program in /home/user_name/bin rather than the (older) version in /opt/program_name/current on a CentOS 5.3 cluster. The program creates a tcsh script using ...
1
vote
2answers
4k views

How can I get vsftpd version into shell variable?

I want to get vsftpd version into shell variable. I can get it to console with ease: # vsftpd -version vsftpd: version 2.2.2 Also I can get a lot of other info into variable: # i=`bash --version ...
2
votes
2answers
3k views

How to write a shell script that gets executed on login in?

I am trying to write bash shell script in Ubuntu 11.10 Linux distro, that will get executed automatically on logging into the system. But I am not able to figure out that what to write in script that ...
1
vote
1answer
813 views

How to move files with same name and concatenate

My directory structure is given below. I need to move all the folders from Test3 to Test2 and concatenate the files with same names [jg@hpc Test2]$ tree . |-- Sample_1008 | |-- ...
10
votes
4answers
6k views

What's the easiest way to find an unused local port?

What's the easiest way to find an unused local port? Currently I'm using something similar to this: port=$RANDOM quit=0 while [ "$quit" -ne 1 ]; do netstat -a | grep $port >> /dev/null if ...
2
votes
2answers
1k views

Concatenate multiple files under subdirectories

My directory structure is given below x:\Project_2012-158A\Sample_4041 SampleSheet.csv 4041_CGTACG_L002_R1_001.fastq 4041_CGTACG_L002_R2_001.fastq 4041_CGTACG_L006_R2_001.fastq ...
3
votes
2answers
4k views

How to loop through each file in FTP directory using a bash script [duplicate]

Possible Duplicate: How to delete the oldest file over FTP using CURL? I need to connect to a remote server using a bash script and then delete all files within the directory that are older ...
4
votes
4answers
2k views

Make cp return an error value if the target exists

Is there a way to make cp (from GNU coreutils on Linux) return a nonzero value in case the target file does already exist? Or is there any other small utility which is commonly available and which ...
0
votes
2answers
310 views

Easiest way to find/replace in a file using a list?

I have a file, foo.txt, and a regexp I want to find in that file. Each time I find the regexp, I want to take a line from another file, bar.txt, and substitute it in for the regexp match I found in ...
2
votes
2answers
2k views

Why does this “while read” work in a terminal, but not in a shell script?

I ran into this interesting issue while populating my WM bar with info text, which is applied by setting the root window's title, i.e. xsetroot -name "clever words" To this end, printing a fortune ...
18
votes
2answers
3k views

In bash, is it possible to use an integer variable in the loop control of a for loop?

I have the following bash script: #!/bin/bash upperlim=10 for i in {0..10} do echo $i done for i in {0..$upperlim} do echo $i done The first for loop (without the variable upperlim in the loop ...
0
votes
1answer
667 views

script to switch users keep running? [duplicate]

Possible Duplicate: Switching to superuser while shell script is running I need to switch users in a script and keep executing commands. I thought -c would help but i don't know how to use ...
2
votes
5answers
5k views

Get the newest file from directory structure year/month/date/time

I store backups of databases in a directory structure year/month/day/time/backup_name an example would be basics_mini/2012/11/05/012232/RATIONAL.0.db2inst1.NODE0000.20110505004037.001 ...
2
votes
1answer
4k views

sed special character replace not working in shell script

I want to write a script 'test.sh' that will take a user's input and replace all special characters with a '\' + the character. My script: #!/bin/bash echo 'input='"$1" arg=`echo "$1" | sed ...
1
vote
2answers
12k views

How to add arithmetic variables in a script

I want to accumulate the line size of a number of files contained in a folder. I have written the following script: let a=0 let num=0 for i in folder/* do num=`cat $i | wc -l` ...
0
votes
2answers
548 views

Is a shell script is a programming Language [closed]

This is the first question in UNIX: I was started shell script from 2 days before. But I have a conflict: is a shell script a special programming language for a specific shell??
4
votes
3answers
927 views

Find files that have words in common

What would be the best way to create a list of files that have common words with a given file. For example, if I had: $ ls mainFile file1 file2 file file4 $ cat mainFile exquisite malicious ...