0
votes
2answers
26 views

need help in making script

I want to automate one task in UNIX and make one script. There is directory in which everyday 2 files comes and that files come anytime in between 10 pm to 1 am. file name is ...
7
votes
2answers
90 views

Are quotes needed for local variable assignment?

Can I safely omit quotes on the right side of a local assignment? function foo { local myvar=${bar} stuff() } I'm mainly interested in bash, but any info on corner cases in other shells are ...
17
votes
9answers
662 views

for vs find in bash

When looping through files there are two ways: 1. use a for-loop for f in *; do echo "$f" done 2. use find find * -prune | while read f; do echo "$f" done Assuming these two loops will ...
2
votes
4answers
105 views

How to catch an error in a linux bash script?

I made the following script: # !/bin/bash # OUTPUT-COLORING red='\e[0;31m' green='\e[0;32m' NC='\e[0m' # No Color # FUNCTIONS # directoryExists - Does the directory exist? function directoryExists ...
0
votes
1answer
746 views

Can I redirect output to a log file and background a process at the same time?

Can I redirect output to a log file and background a process at the same time? In other words, can I do something like this? nohup java -jar myProgram.jar 2>$1 > output.log & Or, is that ...
1
vote
1answer
37 views

while loop is running only once?

I am trying to make a clip out of video file by playing it only for certain interval. make_mclip.sh #!/bin/bash mediafile=$@ mediafile_fullpath=$PWD/./$mediafile tmpedlfile=$(mktemp) mplayer ...
3
votes
2answers
79 views

Bash-script. Shift seconds

Maybe somebody can help me. In bash I don't know how to do that. I need to do a bash-script. At stdin I have .srt file of subtitles in this format: num HH:MM:SS,SSS --> HH:MM:SS,SSS text line 1 ...
0
votes
5answers
63 views

How can I modify variables

I have the following variable: col=1,3,4, Is there anyway to select the numbers within the variable: (i.e. 1 3 4 and work with them? Such as choosing the "1", "3", or "4" column from a .txt file? ...
1
vote
1answer
382 views

Script that unpacks a initrd, allows editing of the preseed.cfg and the packs it to cpio and gzip again

I want to program a script that allows what is said in the title. So basically I gunzip the initrd, than unpack the cpio, open vi to allow editing, save, pack with cpio, and gzip again, so nothing ...
1
vote
1answer
88 views

What is the difference between ' and "? [duplicate]

I tried to create a text file in a bash script. The echo command spans multiple lines and has some double quotes "". #!/bin/bash echo "blabla bla bla bla "blabla" bla bla " bla bla bla" and so on ...
0
votes
0answers
19 views

When adding a ip via ifcfg how do you have it auto increment the clonenum?

I'm writing a script that adds ips to a multihomed machine. I'm not allowed to use network-scripts folder because well that's what they said. They also stated they wanted to clone num to increase. ...
4
votes
1answer
59 views

returncode of command in a pipline [duplicate]

The following script runs on Solaris using /bin/ksh and on Linux using /bin/sh cmd | tee -a cmd.log | tail exit $? The output of cmd is saved in a file cmd.log and the last lines are displayed on ...
1
vote
1answer
64 views

Script to delete text files

I was trying to make a script that searches for all ASCII text files in the directory that you give and after that writes path of every file to a text file. After that it suppose to show head of each ...
2
votes
4answers
56 views

Delete all files in directories except those whose path are listed in a file

Given the following files: data/A/a.txt data/B/b.pdf ... date/P/whatever.log ... data/Z/z.jpg I would like to delete all files in the data/A/, data/B/, ..., data/Z/ directories except those files ...
3
votes
2answers
51 views

Running commands after event based outputs

there are commands like iwevent or tcpdump -n src host x.x.x.x that send to the stdout some lines when something happens. Is there any form of running some command inmmediatly after a ...

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