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

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Delayed Expansion

I wanna make a quine .sh script, and this is what I've made so far: quine.sh: #!/bin/sh function quine(){ q="#!/bin/sh\nfunction quine(){\nq=$q\necho -e \$q\n}\nquine()" echo -e $q } quine() Focus ...
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1answer
33 views

How to handle sub-command line in shell script?

I am new to Linux and I am doing a Bluetooth Low energy project using the Intel Edison. The Edison has a Yocto 1.6.1 on it. I used Bluz and gatttool to connect my BLE sensor. But I need to type the ...
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1answer
21 views

How to hide Login/Pwd into shell?

I've a Shell script(.run) that let me to connect into Oracle sql : echo whenever sqlerror exit | sqlplus Login/Passwd@SERVER @"TABLE1.sql" echo 'return code : ' $? I'd like to hide ...
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1answer
22 views

Reading file using shell script, format of the line has changed

I am reading a file using the following code: displayLine(){ echo $line } filename="SampleFile" while read line do displayLine $line done < "$filename" The format of the file that I am ...
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3answers
21 views

How to bulk compress different sub-folders?

I have a folder all_folders which contains 5 folders: ./all_folders ./all_folders/folder1 ./all_folders/folder2 ./all_folders/folder3 ./all_folders/folder4 ./all_folders/folder5 Can I compress all ...
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3answers
33 views

How to determine callee function name in a script

To make it short, doing something like: -bash$ function tt { echo $0; } -bash$ tt $0 will return -bash, but how to get the function name called, i.e. tt in this example instead?
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1answer
1k views

How can I kill child processes with start-stop-daemon?

I'm writing a simple web server using nc and bash. It looks like this: #!/bin/bash rm -f /var/run/streamman/out mkfifo /var/run/streamman/out trap "rm -f /var/run/streamman/out" EXIT while true do ...
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1answer
53 views

How do I maintain sudo in a bash script?

If I run this script, how do I pass super user permissions to it? I wrote this just to setup new machines with the basics. I don't want to run every command with elevated permissions, but the commands ...
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4answers
43 views

Grep for a string and then echo a string back from a record

I have the following record: MiraServ.log.10:2016/02/07 15:25:13 3 All stations busy!! MiraServ.log.10:2016/02/07 15:25:13 1 TranHasError (3627,-2) ...
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1answer
28 views

Inside a bash script doing an ssh, automatically add the host only for certain known RSA keys

I have a Chron job running a bash script that then SSH's to a my server. But my server's IP address changes from time to time (my bash script has a way of finding looking up the new IP address). But ...
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2answers
148 views

Compare two times in HH:MM:SS format - ksh

Is it possible to compare two time (24-hour format)? What I need is to just check if the first time is earlier than the second time. Example: $ ./script.ksh 09:30:15 13:00:34 okay $ ./script.ksh ...
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2answers
39 views

Check if a file contains a certain pattern?

#!/usr/bin/expect -f ps ps -ef > test.txt Now if I want to check whether test.txt has certain keywords present, in it, how do we go about? say: 'apache' or 'fast' Can we use the if statement ...
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1answer
19 views

Remove file name when recursively counting number of occurrences of a pattern

When I run my grep command: grep -rc 'PATTERN' . it prints out the number of lines that the pattern occurs, but it looks like this: ./hotel_232424.dat:234 and so on... How would I remove the ...
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0answers
27 views

How to execute a command after ssh login via batch file

I want to execute a set of commands at once I login to a ssh session everytime via a batch file. Eg: start putty.lnk -load "session" -ssh username -pw password -m <commands> Here I am using ...
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1answer
36 views

Convert a column of epochs into a time column starting from 0

What I have Hi, imagine a lot of this files, where first column is epoch, and the other(s) column(s) are some data: 1000333,34,1 1001456,56,0 1005356,34,2 What I need I need to transform them ...
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1answer
23 views

Need a script for adding bulk IP aliases in CentOS [on hold]

Need a script for adding bulk IP aliases in linux server (CentOS 6.7) As we manually add for eg. ifcfg:eth0:1 but adding 150 to 200 interfaces manually is a lengthy work. SO need a script which will ...
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0answers
26 views

bash shell scripting - How do I check the values stored in a variable? [on hold]

I ran the code below that returns the number of results as 14 which is correct. NUMBERRESULTS=$(curl -s "privateserver:3000/devices/restful_api_device/… jq '.[]|length') echo ...
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0answers
26 views

Decrease time taken to execute script remotely [on hold]

I have 2 scripts on my prod AIX server, one to suspend db and another one to resume db. When I run the scripts from the prod server the suspend and resume completes in 2 secs. For backup purposes I ...
6
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1answer
83 views

Trap Ctrl-C in awk script

I believe Ctrl-C can be trapped in bash scripts. Is it also possible to trap it inside an Awk script in order to handle that event? For example, for aborting processing, but printing the results of ...
1
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1answer
44 views

Logrotation of a file

I want to rotate a file and place the rotated file inside a new directory called 'backup'. The rotation of the log is working fine where the rotated file is not getting moved inside the backup ...
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3answers
28 views

Backup script fails with the rsync command's options in a quoted variable

Using: rsync version 3.1.0 protocol version 31; Linux Mint 17 (based on: Ubuntu 14.04.3) In one of my backup Bash scripts, which uses rsync, I put the rsync options in a variable like this: # Set ...
3
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2answers
128 views

Is there a way I can grep recursively over all the files in the current directory to find a pattern and then print it in order of high to low?

So so far, the code looks like this: grep -rc 'Author' $1 It prints out all the files in the directory, which is taken as an argument. However, how would I sort the output (for example): - ...
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2answers
834 views

Command/scripts to check the Reverse DNS Lookup time

I am working on a project in which one master communicates with numbers of slaves. For that it has to make connection with hosts in network. But sometimes it hangs. I think that the reason behind is ...
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0answers
32 views

Multiple sed commands in a file

I want to save a .txt file to 2 separate .txt files using command placed in a .txt file. I can use sed -e '1,20 w file1' -e '21,$ w file2' input.txt But how would I plac e this command in a file ...
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2answers
93 views

What do you use when you can't use Bash? [on hold]

I am trying to make a shell script that runs on a widest variety of *nix systems. So, if I wrote a bash script backwards compatible with old versions of the shell, but what if bash wasn't on the ...
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1answer
42 views

How while loop execute in the shell script for the FALSE condition?

I tried it with some example but it is not clear to me. FIRST EXAMPLE #!/bin/bash i=0 while [ $i -lt 10 ] do echo "$i" i=`echo "$i + 1" | bc` done output ===> 0,1,2,3,4,5,6,7,8,9 now ...
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0answers
39 views

Script for logging in to multiple servers and running some commands [on hold]

I have a list of host/server names in a text file. I want to log in to each host using SSH and run certain commands. I'm using password authentication. When ssh'ing to another server, how to handle ...
0
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0answers
6 views

db2 cursor in shell script

I want to select a row from table in db2 DB and check for each column value like while col1 = do else . I cannot direct the text to a file and use it. Can some one tell me how can i do this?
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1answer
959 views

Shell Script Help - Automatically assign users to group

Recently, I have just started to learn linux and I am currently trying to make a shell script that can automate the task of creating user accounts, assigning them passwords and then assigning them to ...
1
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1answer
30 views

Comparing original & backup folder, then deleting non-existing files

I'm using Raspbian jessie (ubuntu). I made a .sh that makes a backup .img of everything (excluding mnt, tmp, run, dev, boot, etc.) and let this run once a week with crontab. It checks for modified ...
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4answers
18k views

find n most frequent words in a file

I want to find, say, 10 most common word in a text file. Firstly, solution should be optimized for keystrokes (in other words - my time). Secondly, for the performance. Here is what I have so far to ...
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3answers
36 views

Can I compare the parameter of a script to an array of variables and process it?

I want to manipulate the expanded value of a variable that has been selected from an array after user input. Here's what I mean: $ ./myscript.sh url2 #!/bin/bash array=(Sigil wp2epub csskit) ...
3
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2answers
52 views

Bash script to extract some information from Ebay HTML pages

I would like to filter the output of a search on ebay which I've exported to a text file. There are a number of results in the search but I've included just one example at the bottom of this post as ...
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3answers
35 views

Joining two parts together to make a single script

I'm trying to create a script to do the following: extract the magnet link from a lynx bookmark and then use it as part of a curl command. like this: curl ...
1
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2answers
138 views

View timestamp for CUPS print jobs

I'm looking for a way to view the timestamp of a job in CUPS. I've searched the man pages and can't seem to find it. The long term goal is to have a script that parses the time from the jobID and ...
1
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1answer
22 views

Issue with resize and stty on remote ssh script?

Scenario: Source host (Solaris 5.10, KSH), im trying to run the following script named sample.ksh on source #!/bin/ksh set -x Rediscover () { ssh user@hostB ./scripts/test.ksh } Rediscover exit 0 ...
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1answer
26 views

Give the command to remove duplicate lines in a .txt file and save the new file as new.txt file

I'm trying to do this but I cant create the file. I enter: sort myfile.txt uniq -u | tee newfile.txt and It wont create the file automatically. What am I missing here?
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1answer
30 views

separation of files on the basis of their name

I have a folder containing lots of files like 3 lac plus files. I have to separate them according to their names in three different folders. e.g. a few names are: 7msf_stem_0_mcannotate.pdb ...
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1answer
18 views

How to prevent garbled screen display while running scripts on remote hosts?

Current scenario: I am trying to run Unix shell script from a solaris 5.10 box, within the script one of the tasks is to ssh to another Linux host (ssh-key pair already setup) and run a set of ...
2
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2answers
46 views

How to ensure echo into a file has been flushed? [on hold]

I have two co-operating programs X and Y running on the same system. X some times uses Y to calculate some information. I use file based communication between the programs. When X wants Y to compute ...
2
votes
1answer
39 views

Adding folder name to .zip files inside it

I have file1.zip, file2.zip, etc. in folder called folder1. have similar folders folder2, folder3, etc. I need to add folder name to each .zip file inside these folders. So, files inside folder1 ...
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2answers
23 views

How do I create a rule for custom flag replacement with C shell?

I want to have the following behavior with grep: grep --java <rest of the command> Where --java would either dynamically convert to --include=*.java or internally be equivalent to it. Is ...
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2answers
42 views

how to login a user using shell script [on hold]

In my computer i have two user(tiger,jenk) now i want to create a shell script for login user "jenk" from user "tiger" i m try this code [tiger@pagaltiger mytask]$ echo -e "IncorrectPassword\n" | ...
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2answers
27 views

Exec vs source error on ==

I run a strange error with the following code: #!/usr/bin/env bash a="a" b="a" if [ "$a" == "$b" ] then echo "Eq" fi chmod u+x script.sh Then executing the file will display Eq: $ ./script.sh ...
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votes
1answer
44 views

KSH for generating 'n' of rows for a table dynamically : Issue with if else statement

I need to generate billion of records in a text file for table loading purpose. My destination table defination is: CREATE TABLE txnrecords12( txnno int, txndate string, custno int, ...
0
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2answers
30 views

How do I search a directory of data files and print out how many times a certain word appears in each file?

This is what I currently have, however it prints the total number of times Author appears in all of the files: 128367 grep -roh 'Author' $1 | wc -w However how do I print out the word count for ...
0
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2answers
46 views

Need help in data arrangement

Could you please help me to sort this out, I have data which i would like get output in below format using shell/perl script. Data: Virtual Machine Test status Running. Assigned Server ...
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3answers
137 views

How do I run a command in a different tty?

Suppose there are two terminals, pts/0 and pts/1. In pts/0, I have fired a command: ls>/dev/pts/1 Then, we only get the output of the ls command in pts/1, but I want to run a command as well as ...
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2answers
68 views
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2answers
58 views

Stop bash script with any key

I'm writing a custom gnome-terminal profile which I want to stop with any key I choose. After pressing the key, my intention is to complete all my commands at that moment and start su. I've tried ...