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

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0
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1answer
85 views

Unable to move files with SFTP

I'm trying to move files from one location to another on the remote server using sftp below: for i in a b c d do sftp $REMUSR <<EOM>>$OUT 2>&1 rename ...
1
vote
2answers
140 views

How to show specific lines from specific columns of a file

First off, I'm not allowed awk, sed or perl. For my assignment I was given a file of employee list: Marketing Ranjit Singh FULLEagles Dean Johnson Marketing Ken Whillans FULLEagles ...
3
votes
3answers
207 views

'is a directory' error when trying to pass directory name into function

Note: I am a newbie to bash scripting In my bash script, I use find to get the folder names by wildcard: for i in $(find ${directory} -mindepth 1 -type d -name ${wildcard}); do stuff=doStuff ${i} ...
1
vote
1answer
46 views

Use a bash function in a pipelined command

I have a command similar to: ... | sort -u -V. Since some versions of sort do not support the -V flag, I thought it would be great if I made a function that conditionally adds the flag. But, it seems ...
1
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1answer
88 views

Is there a GUI debugger for shell scripts

Debugging bash scripts on command line is complicated. Is there a good GUI based debugger available for debugging bash scripts?
2
votes
1answer
59 views

if else statement in one line using && and ||

I would like to know if these 2 ways are equivalent: First: #!/bin/bash if [ -x $FILE ] then echo "You have execution permission to a "$FILE"" else echo "You don't have execution permission to a ...
1
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0answers
46 views

How do I replace symlinks in a path with their target within a script? [closed]

I want to extract part of a file path up to a symlink, use readlink to find the path to the link target, and then replace the link name with the actual path. This has to be done within a script. For ...
-3
votes
1answer
149 views

how to select specific range of line & count the specific occurence of the first charcter w.r.t. each unique second charcter? [closed]

Hi I have a file like this : #0 0:() 1b:cg*b 1c 0:cg xe #4 0:() 0b:cg*b xc 0:cg 1e #8 0:() 0b:cg*b xc 0:cg xe #12 1b:cg*b xc 0:cg 0e #16 xb:cg*b 1c xe #20 1:() xb:cg*b xc 1:cg 1e #24 x:() xb:cg*b xc ...
0
votes
0answers
26 views

Overlapping of cron instance

While searching for a solution to synchronize cron (i.e. only one instance of cron run at at time). I found the solution, given below, on StackExchange. #!/bin/sh LOCK=/var/tmp/mylock if [ -f $LOCK ...
1
vote
5answers
257 views

Copying files with a specific pattern

I am trying to copy files from one location to another and given below are some sample ones: aaa_bbb_ccc_ddd_cost_code_20140330.gz aaa_bbb_ccc_ddd_revenue_zone_20140329.gz ...
1
vote
1answer
38 views

Delete a matching line in a file doesn't work

So, I have this piece of a code: while read line do if [ $line = $maddr ] ; then sed -i '/${maddr}/d' mailinglist found=true ...
0
votes
0answers
22 views

renaming files in sequential order [duplicate]

I have following files SSt12.precip.374.sub.climatology.ctl SSt12.precip.2874.sub.climatology.ctl SSt12.precip.3764.sub.climatology.ctl SSt12.precip.6774.sub.climatology.ctl I want to rename as ...
4
votes
1answer
39 views

Memory consumption of a script

Is there way to check the memory (physical & virtual) consumption of a script, of course in the moment of its execution. Calculating the used memory minus the used memory before and after the ...
1
vote
0answers
42 views

Why below script is not able to find and delete files [closed]

Why below find command does not find and delete files ? I am launching it like this ./script.sh 1 MYFOLDER days_period=$1 myuser=$(whoami) folder_prefix=$2 LOGS_DIR=~/$folder_prefix/logs if [ $# ...
1
vote
1answer
113 views

Unreadable backup directory on a USB drive

The title pretty much sums it up. I was editing a script I wrote some time ago to automatically backup the contents of my Raspberry Pi SD card, and in the course of editing, I missed a "/", and so ...
0
votes
2answers
186 views

How to run a command with a hidden password

I need to run a curl command that accesses a website that another person has the password to. e.g. curl --basic --user myfriendsname:friendspassword http://www.updateinfo.com I need a way where I ...
0
votes
0answers
58 views

TAR not excluding directories with date pattern

I've written this small script: #!/bin/bash TODAY=`date --rfc-3339=date` CHECKDATE=`date --date "2 days ago" --rfc-3339=date` FILENAME=$TODAY-package.tar tar cvf $FILENAME --no-recursion ...
1
vote
1answer
36 views

Problem in using user defined variable in a script

The following is a simple script, named myscript, that I wrote in order to run a command. dcmpath='$HOME/Data' dcmfile='IM1' dcm2nii $dcmpath/$dcmfile Unfortunately, bash does not recognize the ...
2
votes
3answers
90 views

Script needs to read echoed line

So, I need to write a Bourne-shell script, where my script has to work with the line, that was just echoed to stdout - e.g.: echo *something* | myscript.sh [parametres...] This may be a basic ...
3
votes
1answer
86 views

Difference between “.” and “./” while setting the environment variables using export? [duplicate]

Please excuse me if I am not clear while asking questions. I will try my best to be very clear while asking questions. While learning Embedded Linux, we are setting an environment for our project. ...
7
votes
2answers
367 views

Check bash/shell script dependencies

Is there a method/command to check for the dependencies of a bash script? In other words, a response to this question : Which libraries should a user install to run the script? I can do this ...
2
votes
1answer
61 views

Grabbing keyboard control in shell script

I have a certain shell (zsh) script which reads one character at a time and performs an action afterwards. In the shell, this is realized by "read -k" in a loop. I want to execute the script as a ...
2
votes
2answers
78 views

Killing background process in bash script when exiting the script

I have a script that tail a file while displaying a clock in the top right corner. I took the clock part from the internet, and it works ok. The entire script is something like (I simplified): while ...
1
vote
2answers
78 views

Create file with specific formatting from directory contents

I am using Solaris and csh. In $home/test there are five files: a.txt, b.txt, c.txt, d.txt and e.txt. If I run % find $home/test/ -type f -print > ../filenames.txt that file will look like: ...
1
vote
1answer
33 views

observing script execution with monit script seems to ignore pipes

I want to have a bash command running in the background and being watched by monit. To get the PID of this process, I found this script on the web and I modified it to fit my commands: (named sdr.sh) ...
3
votes
2answers
33 views

Trigger job only once and only when load is low

I'd like have automatic update of my gtags, but only when the system is idle. To achieve this, I'm using iupdate to watch over the interesting parts of my source folder. But I have a problem with the ...
2
votes
1answer
73 views

Run script after desktop loads

I'm running a script that changes files and installs things and what not on a SUSE computer. One of the scripts that gets run with my script, reboots the computer and when the computer loads back up ...
4
votes
3answers
792 views

Passing named arguments to shell scripts

Is there any easy way to pass (receive) named parameters to a shell script? For example, my_script -p_out '/some/path' -arg_1 '5' And inside my_script.sh receive them as: # I believe this ...
1
vote
0answers
55 views

Cron job running but not establishing tunnel

I have a script which establishes a reverse tunnel on an endpoint HostB. It looks like this: cat tun.sh #!/usr/bin/env bash # Test code /usr/bin/ssh -V 1> /home/userA/bin/tun.stdout 2> ...
1
vote
3answers
291 views

Bash script for automatic tar backup of chosen files and directories

Within a given directory in linux environment, I need to pick all files modified after a certain date (let's say 7 days) as well as all directories (only in root directory, hence non recursively) ...
1
vote
1answer
26 views

check if genisoimage is succesful

I use a script to convert all VIDEO_TS directories to .ISO. How can I check if genisoimage is actually converting it instead of it failling and converting the next folder? After conversion I have a ...
21
votes
2answers
1k views

What does “${-#*i}” != “$-” mean?

In /etc/profile I see this: for i in /etc/profile.d/*.sh ; do if [ -r "$i" ]; then if [ "${-#*i}" != "$-" ]; then . "$i" else . "$i" >/dev/null 2>&1 ...
1
vote
3answers
50 views

Redirect output of a command to two different files [duplicate]

Redirect output of a command to two different files I know I can use tee, but I dont want the output to be printed on the screen I want them to be printed only on the file example : ls > pk.txt ...
1
vote
2answers
102 views

How to properly launch a program and make possible to redirect its running output (stdout and stderr) at a later stage?

The problem is quite simple: I find useful to have the possibility to switch on (and off) the output of some running program in each moment I need. To be more precise I want to be free to redirect ...
3
votes
4answers
154 views

dd remove range of bytes

Given this file $ cat hello.txt hello doge world I would like to remove a range of bytes to end up with this $ cat hello.txt heorld I would like to do this with dd if possible. The reason is ...
0
votes
1answer
115 views

Using Fifo hang script

out="$katalog/out" # wyjscie fifo="$katalog/fifo" # wejscie mkfifo $fifo touch $out [...] #k ./a.out <$fifo >$out & pid=$! [...] # get input line by line loop start echo "$liniain" >> ...
2
votes
0answers
71 views

Why is my inotifywait loop exiting after removing some subdirectories?

i have the following bash script: #!/bin/sh dir1=/source/dir/path/ while inotifywait -qqre modify "$dir1"; do rm -r /destination/dir/path find /source/dir/path/ -name .svn -exec rm -rf '{}' \; ...
0
votes
1answer
133 views

Creating MySQL database and user without password

I am building a set of bash scripts which basically prepare apache virtual hosts, git repositories and other stuff on a cloud server. So far so good, everything is working, but a big problem occurred: ...
5
votes
2answers
263 views

Why doesn't my loop over the output of ls work?

I am trying to feed Directory names into a for loop. My code is as follows: td='/Test/TopDir/' cd "$td" for x in $(ls -d */ | cut -f1 -d'/'); do echo x=$x done The top directory I run this on ...
2
votes
1answer
72 views

cut slice of file based on time when lines are written

i have a process running always with logging file could reach up to 5 giga, sometime i have to take slice of this log based on interval of time (usually i used dd). is there any command in linux to ...
0
votes
2answers
39 views

FTPing to a remote directory

I need to connect to this ftp http://cdiac.ornl.gov/ftp/ndp026b/ and download the files. I did ftp http://cdiac.ornl.gov/ftp/ndp026b/ and it took the ftp prompt but once I entering commands for ...
0
votes
1answer
24 views

What is the format of the data that must be fed to the freetds tool bsqldb?

I need help figuring out how to input my data to bsqldb. I have been looking for a manual or some examples or tutorial but I cant find anything online beside its command line help. I am planning to ...
0
votes
2answers
35 views

Use xdotool in a telnet session

I have to simulate key presses in a telnet session, and everything has to be invoked by a shell script. #!/bin/sh telnet 192.168.1.14 50000 xdotool type "404" However, once the telnet session ...
10
votes
2answers
846 views

Simplest way to comment/uncomment certain lines using command line

Is there a way to comment/uncomment a shell/config/ruby script using command line? for example: $ comment 14-18 bla.conf $ uncomment 14-18 bla.conf this would add or remove # sign on bla.conf on ...
1
vote
1answer
82 views

can't get hello world shell script to run in FreeBSD

Server is running FreeBSD 9.2. Using vim, I wrote the following script called hello: #!/bin/sh echo "hello world" Then I set it as executable: >chmod 755 hello Then I tried to run it from ...
1
vote
2answers
634 views

How can I run a “grep | grep” command as a string in a bash function?

I'm trying to build a command that pipes the results of one grep command to another grep command in a bash function. Ultimately, I want the command executed to look like this: grep -I -r FooBar ...
1
vote
1answer
202 views

wget a file, logging the output and showing the output on prompt

In a bash script, I need to download a file from the web, for doing it i use wget command. I would log the output of wget command, and at "the same time" having the output prompting on terminal. I ...
1
vote
1answer
73 views

apt-get script to update upgrade dist-upgrade clean and autoremove

I wrote this script, #!/bin/bash # if not root, run as root if (( $EUID != 0 )); then sudo /home/jb/bash/update.sh exit fi apt-get update apt-get -y upgrade apt-get -y dist-upgrade apt-get ...
2
votes
2answers
74 views

Sed? Stripping all formatting, i.e line breaks and whitespaces, from a report text file, while masking out certain pieces

I am working on a project in which I need to remove all formatting from a text file including whitespaces and line breaks, then replace any colons with pipes. I've made some headway but I cannot find ...
7
votes
5answers
393 views

List out strings which are substrings of other strings in the list

I have a list of names like so: dog_bone dog_collar dragon cool_dragon lion lion_trainer dog I need to extract out names that appear in other names like so: dragon lion dog I looked through the ...