Comments on: Bash For Loop Examples

By: Philippe Petrinko

Philippe Petrinko — Fri, 27 Jan 2012 10:07:15 +0000

Hi Ram,

Since you are a real beginner, you would really take great benefit self-training on this course free of charge by vivek & contributors:
http://bash.cyberciti.biz/guide/Main_Page

–P

By: Anthony Thyssen

Anthony Thyssen — Fri, 27 Jan 2012 07:48:10 +0000

Note that is you want to append a string that does not start with a ‘.’ (for example the string “_info.txt”) then you need to delimit the variable name….

for i in *; do mv “$i” “${i}_info.txt”; done

By: maxy-millianne

maxy-millianne — Tue, 24 Jan 2012 06:18:28 +0000

Of course, if you want to worry about files with spaces in (and other things?), put quote around the arguments to mv, as in the gp.

By: Ram

Ram — Tue, 10 Jan 2012 18:57:57 +0000

Hi Vivek,
i am trying to run the below code as ram.sh in server as $ sh ./ram.sh

code:

————————-
#!/bin/bash
for i in 1 2 4
do
echo “Welcome $i times”
done
————————-

It fails saying
ram.sh: line 3: syntax error near unexpected token `do
ram.sh: line 3: `do

is that something i need to check which version is the sh and bash used in the server. how to check that.
it is a pretty simple code and it is not workign.
i am running this script in Linux server 64 bit server.

By: andreea

andreea — Sun, 08 Jan 2012 20:54:19 +0000

I have this code that shows the first column which represents the number of insertions of a commit and calculate the sum of all numbers of each line.
if [ $# -eq 2 ]; then
if [ $2 = "added_lines" ]; then
tmpfile=$(mktemp)
sum=0
git log –pretty=tformat: –numstat | tr -s “\n” | cut -f 1 > $tmpfile
for i in $(cat $tmpfile); do
sum=$(($sum + $i))
done
echo “$sum”
rm $tmpfile
But with ‘cut -f 1′ it takes too much time to calculate and to show the result.Can you help me saying how can i do this with ‘awk’ or ‘gawk’?
Please help me.Thanks

By: andreea

andreea — Fri, 06 Jan 2012 18:33:21 +0000

Thanks for your quick answer.
I have another problem.i have to use this script by using git.can you explain me or give some advices how can i use it?thank you very much.

By: Philippe Petrinko

Philippe Petrinko — Thu, 05 Jan 2012 18:23:14 +0000

“infamous” was a private joke-understatement
Sorry, no offense intended!
Vivek website roxxxxs !

– Philippe

By: Philippe Petrinko

Philippe Petrinko — Thu, 05 Jan 2012 17:33:19 +0000

Dear andreea

1) I quote Vivek: “You are free to use our shell scripting forum for questions.”
http://nixcraft.com/shell-scripting/

2) You can learn for free shell scripting with the infamous Vivek’s collaborative Linux Shell Scripting Tutorial
http://bash.cyberciti.biz/guide/Main_Page

Enjoy!

– Philippe

By: andreea

andreea — Thu, 05 Jan 2012 16:21:04 +0000

Hello!
i am beginner and i have to make a bash script in which i have to show the number of lines that were added by the analized commits(in git).can you help me?Thanks.

By: Akshit

Akshit — Wed, 07 Dec 2011 12:36:08 +0000

Hi…
Thanks for the article, it is helpful really.

I want to know one thing.
Let’s say there is file with content
1
2
3
4
5

how can I use for loop and print these numbers?
If you are understanding what I am trying to tell. I want to use the contents of these files and stored in the variable.

By: Hannah

Hannah — Mon, 05 Dec 2011 23:21:12 +0000

Hi all… I have a question about using for loops. Basically, I have a file containing a list of protein ID numbers. what I want to do is create a for loop that can go into this file, grab each protein ID number, and then search the NCBI database to get the fasta sequence of each protein… and then create another file containing all of the fasta sequences….

In general, my problem is that I can’t figure out how to get the protein ID numbers from the output file (ex. $1 in file1) into the for loop script.

This is what I have so far:

for gi in file1
do
fastacmd -d /data/nr -s gi
done

but I need to specify that the gi (protein ID number) is the first column ($1) of file1.

Does this make sense?

By: Sonia McMath

Sonia McMath — Fri, 18 Nov 2011 06:52:02 +0000

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By: Vivek Gite

Vivek Gite — Tue, 25 Oct 2011 11:19:02 +0000

GNU/Bash v4.2.8 does supports {1..5} syntax. What is the output of the following commands?

ls -l /bin/bash
/bin/bash --version

By: Philippe Petrinko

Philippe Petrinko — Tue, 25 Oct 2011 09:01:00 +0000

This code has to be written into a text file, which must be made executable.
Did you do that?

By: ptrac3

ptrac3 — Mon, 24 Oct 2011 17:43:05 +0000

Very handful tutorial! : ) But i’ve got a problem on my Ubuntu linux box, a strange problem.. Executing the example code

#!/bin/bash
for i in {1..5}
do
echo “Welcome $i times”
done

i get as output Welcome {1..5} times. So the bash doesn’t understand the range {1..5}…Have any idea? My bash version is GNU bash, version 4.2.8(1)-release (x86_64-pc-linux-gnu). Thank u : )

By: Nagesh

Nagesh — Wed, 14 Sep 2011 10:21:45 +0000

This post is 3 yrs old but still RockS.\m/

By: ITtuition.com

ITtuition.com — Thu, 11 Aug 2011 13:30:06 +0000

Spot on. Included all examples that form a good base. Thanks for sharing.

By: Philippe Petrinko

Philippe Petrinko — Thu, 11 Aug 2011 08:48:44 +0000

You could start learning shell scripting:

About [for] loops: http://bash.cyberciti.biz/guide/For_loop

( from that excellent http://bash.cyberciti.biz/guide/Main_Page )

Enjoy!

By: Sam McAllister

Sam McAllister — Thu, 11 Aug 2011 07:47:27 +0000

Haha ok thanks :)

By: Anthony Thyssen

Anthony Thyssen — Thu, 11 Aug 2011 07:25:41 +0000

Start a new thread!