A script is a sequence of commands or instructions that are executed by an interpreter program rather than compiled into a standalone executable program.

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-1
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1answer
105 views

just wanted to know what am i doing wrong in the end of this script that doesnt put my checkdate in to cal command

#Purpose: Validate a date #Usage: chkdate year month day # if [ $# -eq 0 ]; then echo Usage: chkdate year month day exit 0 fi year=$1; month=$2; day=$3; extra=$4 if [[ "$extra" != "" ...
16
votes
2answers
3k views

How does awk '!a[$0]++' work?

This one-liner removes duplicate lines from text input without pre-sorting. For example: $ cat >f q w e w r $ awk '!a[$0]++' <f q w e r $ The original code I have found on the internets ...
2
votes
1answer
77 views

How to write this replacement with condition

I want to replace now within my working directories the word -> with $\to$ if the word is not within verbatim environment. Pseudocode Replace all entriens of -> with $\to$ everywhere else but not ...
9
votes
2answers
2k views

How to non-invasively test for write access to a file?

In a shell script, how do I easily and non-invasively test for write access to a file without actually attempting to modify the file? I could parse the output of stat, but that seems really complex, ...
2
votes
1answer
454 views

How to remove file log with file name

Assume, I have log files with this name format. NameLog.log.2014-09-27 NameLog.log.2014-09-28 NameLog.log.2014-09-29 NameLog.log.2014-09-30 NameLog.log.2014-10-01 NameLog.log.2014-10-02 ...
3
votes
2answers
428 views

How to write this pseudocode where condition

This question is extension of this question about listing questions of directories. I get a problem that I need to understand the original section of the text. Current output where you see the ...
1
vote
2answers
177 views

ffmpeg script - slicing a video into multiple slices

I am currently using ffmpeg to slice video files. I automated the process through a script called ffmpeg_split.sh. To view the script click here. When I run the script I have an error when trying to ...
0
votes
2answers
75 views

copy and rename script

Directory A: 1111111_1.pdf 2222222_1.pdf 1234567_1.pdf Directory B: abcdefg.pdf zzzzzzz.pdf 1234567.pdf 1111111.pdf 2222222.pdf ...
7
votes
2answers
518 views

What is the reliable way of getting each user's .ssh directory from bash?

I can parse the /etc/passwd with augtool: myuser=bob usershome=`augtool -L -A --transform "Passwd incl /etc/passwd" print "/files/etc/passwd/$myuser/home" | sed -En 's/\/.* = (.*)/\1/p'` ...but it ...
1
vote
3answers
558 views

I want to divide a sum of numbers by a value

So here is my code for Unix shell scripting #! /bin/ksh echo "Enter your first number:" read first echo "Enter your second number:" read second echo "Enter your third number:" read ...
4
votes
2answers
196 views

When is 'if' not necessary?

In some scripts, I've seen if conditional statements written as: if [ some_conditional_statement ]; then # do stuff fi or [ some_conditional_statement ] && #do stuff Is the second ...
3
votes
3answers
2k views

How to copy, execute and retrieve data from a remote computer?

I am trying to run some calculations on a remote computer. Basically I want to copy some files to the computer, load a software, execute the calculation, then retrieve the data back. I have created a ...
2
votes
1answer
526 views

Interacting with webpage through script?

I have an email-account where I've ended-up with a lot (200 000) of messages in the Spam-folder. Unfortunately, it's not all spam - partly due to badly trained filter and partly due to mail-list ...
4
votes
1answer
3k views

How to pass environment variables to a non-interactive shell (with example)?

In a sh script another sh script is started with su -l <user> -c /path/to/script.sh. As far as I understood script.sh will be run in a non-interactive shell. The official documentation tries to ...
2
votes
3answers
750 views

How to sum times in a text file using command-line?

I have a text file containing flight times, hours and minutes separated by colon sign, one per line: 00:50 00:41 00:43 00:50 01:24 I am currently using Apple's Numbers application with a simple ...
0
votes
2answers
112 views

merge mutiple files using common column [duplicate]

Say I have multiple files x1, x2,x3,x4, all with common header date, time, year, age. How can I merge them to one singe file X in shell scripting? File x1: date time year age 101014 1344 2012 52 ...
3
votes
2answers
2k views

Interacting with a running interactive console program from a different process

I have a console program with an interactive shell, similar to say, the Python interactive shell. Is there an easy way to start this interactive program A and then use another program B to run A? I ...
2
votes
1answer
269 views

Get the full window dimensions (including decorations) in Unity

I have used the answer to How do I find the window dimensions and position accurately including decorations? in my bash scripts, and had good success with my Silentcast application on Xfce, but now ...
0
votes
0answers
26 views

Can't set PATH with a script [duplicate]

I have written a script which was supposed to add some value to environmental variable PATH, but script doesn't do that if I start it with ./script.sh. #! /bin/bash INSTALLDIR="/opt/ARM" ...
7
votes
1answer
1k views

How do I print all but the Nth to last line in sed?

I'd like to do the complement / "opposite" of sed 13q;d <file.txt More generally, is it possible to do this sort of complement/inverse/opposite in sed? Or only for regexes? How do I print all ...
1
vote
0answers
169 views

Maintain screen session when executing shell script on boot

Solved: I solved this problem by introducing a delay before executing the script: @reboot sleep 60; /root/start_server.sh On Ubuntu 14.04, I have a crontab entry set to run on reboot: @reboot ...
1
vote
3answers
190 views

Find a string in one section of a file with mutiple sections

How to sed/awk for a string contained in another string. TESTVAR=' { icon : "icons/773_l.png", id : 80, initialState : true, isPng : false, label : "Imagery", opacity : 1, requestType : ...
1
vote
1answer
75 views

Is it possible to create a Linux environment without a traditional command shell?

i.e. Using something like IPython, re.pl, or somesuch as a login shell, instead of bash/ksh/etc. Using initscripts, etc. written in Python or some other scripting language, and making no use of ...
1
vote
2answers
557 views

7z from bash script won't exclude directories

I've encountered with kinda strange behaviour of 7z (or bash, I don't know yet.). With the following script: #!/bin/bash find /home/user -type f -name "*.pdf" | cut -c 10- > ...
1
vote
1answer
568 views

how do you include variables in Bind9 configuration files?

I am trying to create a auto install script since I have to do this installation task on multiple servers. I have setup all the bind9 configuration files with my variables and thought it would have ...
1
vote
2answers
573 views

Concatenate file contents AND names

I've been writing for many months. The files I create are dated files named like 2011-06-13.markdown with daily content. I've decided I want to have all the writing in one file instead but I'd like ...
1
vote
2answers
214 views

Why are UNIX shells like this and how can I work around it?

One of the things I've noticed about BASH and other UNIX shells is that, by default and when used in typical ways, they spawn subshells for almost everything. e.g. foo=$(grep "someword" ...
1
vote
0answers
44 views

Is there a version of script that plays nicely with vim?

man script says: Certain interactive commands, such as vi(1), create garbage in the type‐ script file. Script works best with commands that do not manipulate the screen, the results ...
1
vote
1answer
338 views

Telnet no echo output from xinetd script

I have have installed xinetd, and I wrote a script: #!/bin/bash echo "Some text" touch /home/somefile I made a service configuration under /etc/xinetd.d/ and basically it works when I connect to ...
0
votes
2answers
146 views

Bash script: test command -o option

I have a piece of code like this: count=0 until [ -f $filename -o $count -ge 60 ] do count=$((count+1)) sleep 1 done I know [ -f $filename -o $count -ge 60 ] is a test command, "-f $filename" ...
4
votes
2answers
71 views

More shell scripts than one in one text file?

I am learning shell scripting for my introductory UNIX course at my university, and I`m curious if is it possible to have more than one shell script in one text file. What I mean by that is, for ...
3
votes
3answers
175 views

Having an issue searching for a string in a file

I have tried to use a 'case' loop but it doesn't work for a reason unknown to me. This is my script for the case loop. echo "Do you wish to search again? [y/n]" read INPUT_STRING2 case ...
0
votes
1answer
382 views

Uuencode displaying attachment content in email body

I am using uuencode with mailx to attach a zip file. In following code, the if block works perfectly and I get Deletions.zip as an attachment in the email. But, whenever the else block is executed I ...
6
votes
2answers
2k views

Compare two files and print matches

Is there anyway to get this through Unix shell scripting? I have a fileA with one column (1000 rows), and fileB with 26 columns(13000 rows). I need to search each value of fileA with fileB and return ...
4
votes
1answer
2k views

Opening a terminal other than xterm, running a command on it, and not closing the terminal after it succesfully finished

I have the following script in my arch linux box: #!/bin/bash xterm -e "sudo pacman -Syu;bash" This will fire up an xterm, and run the command sudo pacman -Syu on it. Because of the ;bash part, it ...
0
votes
2answers
14k views

Got “syntax error near unexpected end of file” in bash script

I'm making an script that gives me a day like this jjj/yyyy when I give it a day like this dd/mm/yyyy and I need it to have an error when you don't write correctly but I'm starting and it's not ...
6
votes
2answers
703 views

how to mount a range of drives in bash?

I use something like this to unmount a range of drives: umount /dev/sd[c-k]2 Is there any way to use same thing with mount? something like this: mount /dev/sd[c-k]2 /[c2-k2]
2
votes
3answers
791 views

How do you fire a sequence of commands at the command tool?

I had a previous question (deleted it) and I still don't understand why it is so hard to understand what I'm trying to ask, but I'll try once again and more clearly. So I'm copying over several ...
4
votes
2answers
581 views

Compare 2 tab delimited files and output differences with column header

I would like to compare 2 similar files on a common column. The files will have identical headers. file1.txt mem_id Date Time Building aa bb cc dd ee ff ...
2
votes
1answer
44 views

Work out the command line of a GUI operation?

I am trying to script one repetitive operation within an open-source software, FSLView to be specific. The operations are extremely straightforward in the GUI, I mean just several clicks. However, I ...
2
votes
1answer
149 views

create numbered files with defined content with bash

I want to create 69 files with a filename from 4006 through to 7075 and it each file needs to have some enumerated content, the following code prints on the shell what I would like to have inserted ...
2
votes
2answers
359 views

Sed find and replace with slashes

I am having trouble using sed find/replace with slashes in the find parameter. Sample contents of test.sh str=$(sed -n '/^user:/p' /tmp/shadowtest) # find "user:" line in /etc/shadowtest ...
1
vote
1answer
243 views

Pattern replacement

Please can anyone explain to me in brief the syntax of this command. Explanation in terms of how actually this command is written significance of each and every character used. I know the output of ...
5
votes
1answer
386 views

How to save the result of printf to a variable in GDB?

(gdb)printf "Hello %d", 7 Hello 7 (gdb)set $MyVar = printf "Hello %d", 7 // ??? How to save the result of printf "Hello %d", 7 to $MyVar?
3
votes
3answers
308 views

How to mask passwords in 'watch' command?

I am using watch to monitor the progress of a MySQL replication slave. The way I have it set up now, the password shows up in the header of the watch output. I am not exceedingly worried that someone ...
3
votes
1answer
61 views

Read target of symlink and increment target by one

I have a folder structure that looks like this /some/folder/1 /some/folder/2 ... and a symlink current that links to one of the folders. Is it possible and when how to read the target of the link, ...
2
votes
1answer
42 views

Script command without output

Is there something similar to script that records ONLY the commands and not any output from them to a file?
1
vote
1answer
208 views

Startup script with LSB headers not working correctly (dependency problem)?

I am creating a startup script for my Ubuntu 14.04.1 LTS server. The script need to be run after the Rabbit MQ server. The Rabbit MQ startup script says it provides "rabbitmq-server". So I put this ...
-2
votes
2answers
48 views

how to take the file names from folder

i want to write a program for the below logic: Take the names of files in a folder For each file: print file name move the file to another new folder (with the name in dd_mm_yy format)
2
votes
3answers
26k views

How to get a response from any URL?

I have been asked to write a shell script To check if a URL is UP/Working or not for my Project. I tried to find some hints over the internet, but whatever I got is about checking whether the URL ...