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

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0
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2answers
22 views

provide password for script begin called inside another script [duplicate]

I have written a shell script which in turn calls another script, but the second one prompts for password. I want to supply the password and pass the prompt without user begin notified. Here is my ...
-1
votes
0answers
39 views

I'd like to write shell script to connect to database and delete the records automatically [on hold]

Can you please help me to write shell script which should delete records from my delete query and same will be appear in log file by saying record has been deleted. Also once this is done, it should ...
3
votes
1answer
41 views

Edit a file via a script yet maintain the osx tags

On OSX you can have tags which allows you to identify different categories of files. Here are two text files with different tags when viewed in Finder: I have a large number of these files and have ...
0
votes
1answer
10 views

Files missing after using mv and parameter substitution in a loop

Related questions to missing files after mv don't appear to answer my question. The following commands were run within the working directory where the files are located, resulting in missing files. ...
0
votes
2answers
35 views

Gzip file but excluding some directories|files and also append current date

I'm looking for a way to create a .tar.gz file from a directory but I have some doubts. I'm know that the command for create the file is: tar -zcvf /path/to/compressed/file.tar.gz /path/to/compress ...
0
votes
0answers
12 views

single jq command with multiple output possible?

I have json log file test.log {"type":"1","fname":"AAA","lname":"bbb" } {"type":"2","state":"gujarat" } {"type":"3","city":"ahmedabad" } {"type":"3","city":"rajkot" } ...
4
votes
1answer
146 views

Can I refer to a global variable even if a locally scoped one exists with the same name?

If I have a variable x total=3 and then a function function A () { local -i total=0 } Is there any way I can update the 'global' total variable total from within function A ?
1
vote
2answers
53 views

use “read” command to pass lines as positional parameters to a shell script

The following file runs, but not doing anything, yet it does not error.... while read dates; do ./avg_hrly_all_final.sh ${dates}; done < ./dates_all.csv I have a list of dates in ...
0
votes
2answers
26 views

I want to print the value from csv file dynamically

I want to print the values from properties file dynamically I am using below code but getting wrong output. testProperty.properties edmcws,edmbws,edmwt Code ...
3
votes
3answers
80 views

spawn - command not found!

I am using Mac OS X 10.9.4, following is my script to copy files from local machine to different host #!/bin/bash #!/usr/bin/expect echo "I will fail if you give junk values!!" echo " " echo "Enter ...
3
votes
2answers
60 views

Use lines in a file to produce string and file name

I have a file, foo.txt, that has a folder name on each line: folder_1 folder_2 folder_3 And I'd like to do something like this: cat foo.txt | xargs -I {} echo 'function {}() { return stuff; }' ...
2
votes
3answers
55 views

How do I use inserted values using getopts

I have this bash code combined with getopts and if I understood getopts correctly OPTIND contains the index of the next command line option and all the command line options provided to shell script ...
2
votes
1answer
40 views

attempting to put dynamic input data in a variable via cat method

I'm attempting to write a bash script that should be able to collect data from ttyS0 and put in a variable. I need to talk with a device on the serial line, that is a module able to receive AT ...
1
vote
3answers
49 views

Traverse all subdirectories in and do something in Unix shell script

I am new to bash scripting. I am working on a shell script and got stuck from last 3 days. I want my shell script to visit all subdirectories in a main directory. Do something in directories, sent ...
1
vote
2answers
43 views

Extracting numbers with a decimal point from ls output in Bash

I would like to extract the numeric part of the file names that begin with "hsli" and end with ".h5" in Bash on Ubuntu 14.04.1 64-bit LTS. My ls -l hsli* output is as follows: -rwxrwxrwx 1 ongun ...
0
votes
1answer
16 views

how to find the files in a directory with Prefix__date_030000_1.txt?

how to find the files in a directory with Prefix__date_030000_Suffix here Prefix is the Actual file name and format of the date is date +%Y%m%d and Suffix is the '.txt' and the 030000 number will ...
0
votes
1answer
21 views

Run windows local program from remote linux

I'm trying to run a python script on a remote linux machine accessed by SSH from my local Windows machine. The script contains a loop where for all files in a directory it's going to go to a certain ...
1
vote
0answers
13 views

Handle compress command error messages on AIX

I am working on production issue and unable to reproduce error message for compress command. Current Solution We have case-esac block in shell wrapper that handles messages as follows; case "$MSG" ...
-3
votes
1answer
36 views

find all .sh files then copy to <date>scriptbackup

Locate all the .sh scripts you have created in your Linux installation (searching recursively if needed – excluding existing backup folders) It will then copy them all into a folder called ...
-2
votes
0answers
19 views

shell script to know the status of a node's application, whether it is up or down [on hold]

I want to know the status of an application and application server which I cant get directly. It is like connecting to a server lets say 'A' and that server has many nodes say A1.A2,A3 and in that ...
1
vote
1answer
41 views

Print lines between two patterns matching a condition in awk

How can I print lines between two patterns which meet a certain condition? For instance for an input file partially containing the following: Time %MEM %CPU %SWAP 00:05:02 7.3 ...
-1
votes
0answers
26 views

Count how many times a word occurs in a txt file with awk

Basically i'm trying to count all instances of certain words that occur in a text file then printing the result. It has to be in done using awk. Im not really sure where to start. Any suggestions?
-4
votes
0answers
28 views

Random password generator [on hold]

Make a random password generator: read 3 to 5 random lines from /usr/dict/words and assemble them together to form a random password. the command should takes an optional minimum size argument that ...
1
vote
1answer
48 views

getopts passing value of declared parameter to function

I have function port.sh as stand alone script and i'm wondering if is possible to put this function in the same script where getopts is and pass value of OPT_B into function and get output of it? ...
0
votes
2answers
40 views

How to call on 3 scripts inside a shell script

I am battling to run a shell script which has 3 scripts which it needs to call and execute one after each other as soon as the execution completes successfully (error: gzip:.gz: unexpected end of ...
0
votes
3answers
44 views

Parent script continues when child exits with non-zero exit code [on hold]

I have a script that calls another script. When the child script fails, I'd like the parent to fail as well. In the child script child_1.sh, I have something like this: if [ $SOME_BAD_CONDITION ] ; ...
0
votes
2answers
58 views

Read line from a file

Hello how can i read each line from a file and compare it with other file... Actually that file should be taken from command line.... please help me out if [[-f $@ ]]; then for "$line" in $@; ...
4
votes
2answers
227 views

Delete files older than specific file

I need to delete from a folder all files older than a specific file. Running bash on CentOS 7. I have a solution for this, but I think there should be a more elegant way do it: ...
1
vote
2answers
45 views

print the output of 2 commands in 1 file on the same line

Thanks for looking at this. I have a possible simple question, but I wasn't able to find any help so far on the internet. I have a script that has mainly 2 commands that process output. But both ...
1
vote
2answers
66 views

Search for matching files with wildcards without using find in a bash script

For an assignment, I'm supposed to write a bash script that can act as a very basic find, but without actually using the find command. For example, if I put in this input: my_find ~/homedir/ -name ...
1
vote
1answer
26 views

Shell script to change directory of terminal and open a second terminal

I am new to writing shell scripts and I am trying to write a script to CD to a folder where my programs are saved for one of my classes, then have a second terminal open that ssh's to a server used ...
0
votes
1answer
30 views

How can I multiply a column by a variable and write out? [duplicate]

I would like to multiply a single column in a .txt file by a variable and then write to another .txt file. What am I missing from the awk line? Appreciate any help in advance. !/bin/bash ...
-1
votes
0answers
48 views

Send mail from BASH/SH file with mailx - mail is not being send

Hello I have this script in a file: #!/bin/bash # email subject SUBJECT="New_fish.app_available" # Email To? # Email text/message EMAILMESSAGE="/tmp/emailmessage.txt" first_line="There's a new ...
7
votes
7answers
2k views

Is there a unix command that gives the maximum of two numbers?

I was looking for a command to limit numbers read in from stdin. I wrote a little script for that purpose (critique is welcome), but I was wondering if there was not a standard command for this, ...
1
vote
0answers
33 views

How do you derive a decimal from a math operation involving a variable?

I'm trying to find derive SCALEFACTOR which is basically 10000/(sum of 4th column in a file). How do I get a decimal from the output? Appreciate any help in advance. #!/bin/bash ...
1
vote
3answers
68 views

How do you parse through a subdirectory where the path contains spaces? [duplicate]

I'm trying to parse through a set of files in a directory on a mapped drive. However, I can't seem to resolve an issue that seems to be because of spaces in the path to the subdirectory. Would ...
0
votes
2answers
31 views

A batch that cout the number of occurrences

I've to extract the number of words using each letter of the alphabet from A to Z. The script that i've to create create take as parameter the name of the dictionary file to analyze and will be used ...
-1
votes
1answer
21 views

Which files are associated with startup and shutdown scripts ? [closed]

AFAIK, the init is the first process that appears in userspace and from there it starts certain scripts which bring the PC into the desired starting state. Something analogous happens at the shutdown. ...
1
vote
2answers
70 views

Is there any way to make scripts dynamic? [closed]

I need my script to show the time till next run, continuously like a timer, is this possible?
2
votes
1answer
53 views

Bash script to detect uploaded files triggers many times for one file

I have a simple bash script setup that uses the built-in inotify daemon running CentOS 6.6. The script will simply echo the file that is upload to a specific directory. The script works but it echos ...
0
votes
1answer
43 views

property file reading from unix shell [closed]

Below is the sample code. products=$PRODUCTS arr=$(echo $products | tr "," "\n") for x in $arr do with="${x}SUBPRODUCTS" subproducts=$(echo "${x}SUBPRODUCTS") echo ...
0
votes
2answers
53 views

help with bash scripting tput getting errors [closed]

I am a beginner to bash scripting. I need help to figure out what is wrong with this tput menu. #!/bin/bash tput setb 3 tput clear function main_menu { option=0 until [ "$option" = "4" ]; do echo ...
0
votes
1answer
62 views

bash if, then and else statement

I am learning bash, I ran into a small problem when trying to write a small script #!/bin/bash clear read num if [ "$num" -eq 2 ] then [ -d "/etc/passwd" ] | sudo cp /etc/passwd /home echo ...
1
vote
2answers
80 views

How do I automate opening Firefox over an ssh tunnel?

My university has access to some academic journals that I cannot access from home. To be able to download papers while I am away, my current proccess is: Create an ssh tunnel to my university ...
1
vote
3answers
54 views

loop test strings to see if input is valid for C program input

For example I have a file filled with some pretty gnarly strings. 12345678900 1111111111111111111111111 ...
0
votes
1answer
33 views

shell scripting and running after switching to other user

I have the following commands that I want to have them all in one shell file: su – s3 lizinfo.sh –b when the first linex executes, it prompts and the command prompt become like as below: ...
2
votes
1answer
67 views

Bash - Split quoted parameters

I have a script which gets called with two parameters: ./script.sh a b I'm currently reading them through $1 and $2 (such as cd $1). My problem is that the output needs to be the same for when the ...
2
votes
2answers
41 views

Why `until` block is designed as it is just a negative version of `while`?

To my understanding, until block is just the opposite version of while, like until "condition A is met" is equivalent to while "condition A is not met". In some modern languages such like python, ...
2
votes
2answers
113 views

Bash menu with multiple parameters in one row

I have searched a couple of days and still didn't found the answer. I hope that you can point me in right direction. I would like to know how to write a bash script with a options, that can be ...
7
votes
7answers
180 views

What is the purpose of having two variables ($@,$*) to transmit the arguments of a command into a script? [duplicate]

I have read of the special variables used in a script $@ and $*. As far as I understand, the arguments used while executing the script are stored into two special variables, once all arguments into $@ ...