3
votes
1answer
23 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 ...
1
vote
2answers
37 views

Pass arguments to a command run by another user

I have a bash script that is supposed to take some arguments and then run in a different user: test.sh #!/bin/bash sudo su user2 <<'EOF' echo $1 EOF However it prints blank: $ ./test.sh ...
0
votes
0answers
28 views

How to get diff for HTML reports?

echo "New defects" echo "===============================" n=0 def_num=0 while read line; do n=$((++n)) if echo $line | grep '^[[:space:]]*>' &>/dev/null; then if [ $(($n % ...
1
vote
2answers
59 views

Shell script throws a not found error when run from a sh file. But if entered manually the commands work

Im trying to use the following script to generate a sitemap for my website. When I run it as sh thsitemap.sh I get an error like this and creates an empty sitemap.xml file : thsitemap.sh: 22: ...
2
votes
2answers
44 views

Pass two (piped) shell commands as a parameter to a shell function

I have defined the following shell functions: success() { printf "[\033[32mSUCCESS\033[0m]\n" } failure() { printf "[\033[31mFAILURE\033[0m]\n" } try() { result=$($* 2>&1) if [ $? ...
2
votes
3answers
51 views

Repeat Last N commands [duplicate]

In bash, I tried writing a script to run the last N commands. For say, N=5 for i in {1...5} do !-5 done The problem is that !-5 gets replaced by the 5th-last command on my shell (say time) and ...
4
votes
3answers
107 views

How do I capture stdin to a variable without stripping any trailing newlines?

In a shell script... How do I capture stdin to a variable without stripping any trailing newlines? Right now I have tried: var=`cat` var=`tee` var=$(tee) In all cases $var will not have the ...
5
votes
2answers
45 views

bash crashed with for loop [duplicate]

The question may be trivial but with this simple for loop for i in {1..10000000}; do echo "$i" line >> file done my shell crashed after some elaboration time (the tab in the terminal emulator ...
4
votes
1answer
76 views

How to catch a signal in command line?

I asked this question. SIGPIPE signal is generated to stop the execution of the command as told in the answer. But how do I capture this signal and gracefully terminate the command? The command exits ...
2
votes
1answer
96 views

Test if telnet port is active within a shell script

I am trying to create a script to test whether it is possible to login via telnet. I do not want to really log in; therefore, expect is not needed. I just want to see if I am able to get a login ...
2
votes
3answers
57 views

When was the script started?

What I want is, -bash-3.2$ ps -aef | grep 29137 jeeadm 9794 1190 0 09:22 pts/2 00:00:00 grep 29137 jeeadm 29137 1 0 Sep02 ? 00:00:21 Java Second Row, Fifth Column entry, as in ...
1
vote
0answers
27 views

Running multiples query on Hbase shell without calling hbase shell again [migrated]

To invoke shell again takes time , i want to execute multiple commands by invoking hbase shell once.Below code run only single query. cmd="echo \"put 'test', 'row1', 'cf:a', 'value1'\"| hbase shell" ...
0
votes
1answer
57 views

Running shell script on cluster in parralel

I thought dsh(Distributed Shel) will be a good option but when i ran my shell script across my nodes, I didnt get expected output, dsh -aM -c bash /home/cloudera/bash_script.sh server2@x.x.x.110: ...
2
votes
1answer
27 views

ionCube shell script gives error

I have this shell script to install ionCube loader: if [[ $(id -u) -ne 0 ]] ; then echo "Please run as root" ; exit 1 ; fi echo "Welcome to this script to install the ionCube loader on CentOS!" cd ...
2
votes
1answer
18 views

Comparison of columns in two files and appending the first file

I need a help on this :- I have a file : emp.txt 21356 suresh 12/12/2012 23511 ramesh 11/06/2011 31456 biswajit 09/08/2013 53134 archan 06/02/2009 first field:- employee id, 2nd field is name and ...
3
votes
1answer
184 views

How does the colon sign and dollar question mark combine in sh?

The "colon sign" and the "dollar question mark" can be combined to check if a sh script does have an argument and assigns it directly to a variable of interest: cmd=${1:? "Usage: $0 ...
3
votes
1answer
24 views

X commands do not start from my at job

I'm learning about Linux scheduling commands including at, cron, sleep etc. I'm trying to launch gedit after x minutes via the at command. This is what I have: kedar@i5 ~ $ at now + 1 minute at now + ...
1
vote
1answer
33 views

How to assign words with spaces as a whole name to variable in shell script? [duplicate]

I need to make some directory of Author name. It's easy when doing them alone. I can simply mkdir "Mario Luis Garcia" This will create one directory named "Mario Luis Garcia" But when trying do it ...
0
votes
2answers
87 views

Getting expr: syntax error on index [duplicate]

Using this OF=$(ps fax | grep 'php-fpm: master process' | awk '{print $1}') IDX=`expr index $OF ' '` I get an error. The results of the $OF variable are: 27797 27495 What is the error here? I ...
1
vote
3answers
97 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 ...
2
votes
5answers
48 views

Append files with bash one-liner?

Currently I use multiple lines to append content into a combined file, e.g. ./myprogram 1.txt > Out.txt # Overwrite for the 1st file ./myprogram 2.txt >> Out.txt ./myprogram 3.txt >> ...
1
vote
1answer
59 views

Compare file size of multiple files in an array [closed]

Scenario: Ftp site has 100s of files. Once a day, all the .gz files are copied to an AWS site then renamed. Only the date is kept in the file name. Some of the files corrupted during copy. A txt ...
1
vote
2answers
111 views

Pass a command to ROOT from a shell script and having it stay open

I am writing a bash script to perform some analysis using the program ROOT. I want to run some initial command to load the result of the analysis, then continue using ROOT interactively. The analysis ...
4
votes
4answers
67 views

Renaming multiple files with rename

I need help renaming files in batch--the other questions I browsed don't exactly address my problem. The names of my files are generated non-deterministically, so I can't predict what they will be ...
2
votes
2answers
52 views

Read Multiple Entries from an Input File

I wrote a program in Fortran that asks me for latitude and longitude and the name of the output file every time I run it. It works great. What I have been meaning to do is run this program for the ...
0
votes
1answer
29 views

What is the term “Usage”?

I am seeing this a lot in the scripts. Is "usage" a command in unix ? I tried googling it but got ambiguous results. Here is an example : ${1?"Usage: $0 ARGUMENT"}
0
votes
1answer
46 views

How to evaluate a variable length in shell script?

I want to write a shell script, in which it will call different command according to the variable length. But I didn't figure it out yet. My unwork script is here: for i in n5 n25 if ${#i} == 2; ...
8
votes
6answers
984 views

How can I test if a variable is empty or contains only spaces?

The following bash syntax verifies if param isn't empty: [[ ! -z $param ]] For example: param="" [[ ! -z $param ]] && echo "I am not zero" No output and its fine. But when param ...
4
votes
1answer
125 views

Proper way to distribute shell scripts

What is the most proper way to distribute shell scripts, if behaviours of shells can be modified by set and thus are unpredictable? For example, rm *.txt wouldn't be executed as expected on the ...
2
votes
1answer
62 views

Arrow key/Enter menu

I need help finding out how to possibly create a menu in a shell script that will display 3 options that a user will use the arrows keys to move the highlight cursor and press enter to select one. If ...
2
votes
1answer
54 views

How can I get this script file's functions to load without having to source it every time? “command not found” (Bash/scripting basics)

How can I get this script file's functions to load without having to source it every time? I created a file foo with script functions I'd like to run. It's in /usr/bin, which is in the PATH. File ...
0
votes
1answer
381 views

Bash script question - skip enter key press [duplicate]

Here is a portion of my script: read main_menu case "$main_menu" in "0" ) exit ;; "1" ) cp /etc/bamt/cgminer.conf.X11 /etc/bamt/cgminer.conf; sudo mine restart; ...
1
vote
1answer
40 views

Bundling of dependencies with shell scripts

Shell scripts often have to depend on tools that may not be installed on the users' computer. To circumvent this problem, many scripts have multiple fallbacks. IMO doing such things only leads to ...
2
votes
2answers
130 views

How to force watch to run under bash

The problem is that when watch is executed it runs sh and I get this error: sh: 1: func1: not found here is the code: #!/bin/bash func1(){ echo $1 } export -f func1 watch func1
1
vote
1answer
34 views

How to slice a text file into several files of 100 lines each? [duplicate]

My question might be quite unclear here. I have a giant text file with values that looks like this 0.00601233 0.000139403 0.000133679 0.000139497 0.000141683 0.000141888 0.000138646 0.000133465 ...
3
votes
1answer
79 views

Why does the read command not take interactive options when run by sh?

I want to download a provisioning script that reads some configuration parameters via read, and execute it: curl http://example.com/provisioning.sh | sh The problem is, that the read command in the ...
2
votes
1answer
125 views

setenv not working in tcsh

I am trying to install a program on my brand-new CentOs. The installation requires setenv, which apparently does not work, not even in the tcsh shell. Can anyone give me some advice? [Anna@anna ...
4
votes
4answers
288 views

what does $* mean in shell [duplicate]

What does $* mean in shell? I have code two function, run_command and run_test, they are called like this: if [ -n "`echo ${GOAT_COMMANDS} | grep $1`" ]; then run_command $* else run_test $* fi ...
3
votes
1answer
80 views

Using inotify to monitor a directory but not working 100%

I have written a bash script to monitor a particular directory /root/secondfolder/: #!/bin/sh while inotifywait -mr -e close_write "/root/secondfolder/" do echo "close_write" done When I ...
2
votes
1answer
81 views

Accumulate Filename in a Log file using shell script

I have files with their names as ABC_-_123321.20140505_-_161500.CSV ABC_-_654145.20140506_-_135020.CSV String_-_SerialID.Date_-_Time.CSV StartDate, StartTime, EndDate and EndTime are given as ...
1
vote
2answers
85 views

sh + how to use array in sh script in order to print all values in array

I want to use arrays in my sh script. My target is to create an array with the values a b c and print all values in the array. I succeeded to print each array, but I failed to print all values in ...
2
votes
1answer
49 views

Displays and their relative position in a shell script

I want to get information about the displays, something like xrandr, but with more info. I want to know their position. So if I have two or more displays connected I want to know how they are ...
2
votes
1answer
46 views

Extracting lines around keys from a file

I have a large file with around 15 million lines. The odd lines contains the keys (but not only the keys) and the even lines are the data. That is, the file is something like: WRTZ Tyrosine ...
1
vote
2answers
58 views

list files and store it in variables

im new with shell programming. my goal is to give the user a selection which file should be run. i catch all available scripts in one var with: var=$(find script*) so far so good.. this is the ...
3
votes
4answers
223 views

How to cut everthing until a specific word / after a find in a script

Hello I try to get the output of files from today wich contains ERROR. I use this to find the files I want: find /home/user/logfilesError/ -maxdepth 1 -type f -name "gandalf_*"\ -daystart -mtime ...
1
vote
3answers
690 views

Difference between ls -l and ll?

I'm relatively new to programming as a whole and some tutorials have been telling me to use ls -l to look at files in a directory and others have been saying ll. I know that ls is a short list, but ...
0
votes
1answer
142 views

How do I cat a command file?

I have the output of the crontab -l stored in a file (crontab_file) with no extension. But whenever I try to cat it, I get errors saying command not found for multiple line of the file. Here is the ...
28
votes
3answers
2k views

What does `{ { (exit 1); exit 1; }; }` mean?

I quoted the next code snippet from config.status generated by configure. if test ! -f "$as_myself"; then { { echo "$as_me:$LINENO: error: cannot find myself; rerun with an absolute path" >&5 ...
2
votes
1answer
102 views

Why is my tar in a script behaving different than using tar manually

I'm writing a backup script for my email and cloud service. For simplicity, I only posted the mail-backup part here. Basically, I have a Host-Machine with some Virtual Boxes running in it. These ...
0
votes
1answer
42 views

Scripting error after bc command

I am trying to execute script contains the following: #!/bin/bash USED=`free -m | more | grep -v total | head -1 | cut -d':' -f2 | cut -d' ' -f18` CACHE=`free -m | more | grep -v Swap | tail -1 | cut ...