Shell Programming and Scripting

Hello,

I want to select first element from 2 to 3 files how I would do that. e.g my input files are:-

Code:

file1=(1,2,3,4)
file2 =(1,2,3,4)
file3=(1,2,3,4)

output should be

Code:

outputfile=(1,1,1,1)

Hello shazo,

Welcome to forums, please do use code tags for commands/codes/Inputs you are using in your posts as per forum rules, regarding your question following may help you in same.

Code:

awk -F, '{X=X?X OFS $1:$1} END{print X}' OFS=, fIle1 fIle2 fIle3 > OUTPUT_file

Thanks,
R. Singh

Thank you ! Yeah sure I will do use code tags. This is reading whole files not first entity. Anyway thanks.

Code:

awk -F, '{X=X?X OFS $1:$1} END{print X}' OFS=, fIle1 fIle2 fIle3 > OUTPUT_file

Moderator's Comments:

CODE tags need to be placed around sample input, sample output, and sample code; not around your entire post.

Hello shazo,

Could you please try following commands and let me know if this helps you.

Code:

cat fIle1 fIle2 fIle3 > OUTPUT_file
OR
awk '1' fIle1 fIle2 fIle3 > OUTPUT_file
OR
cat fIle{1,2,3} > OUTPUT_file   ##In Bash, ksh, zsh
OR
awk '1' fIle{1,2,3} > OUTPUT_file   ##In Bash, ksh, zsh

Thanks,
R. Singh

it still reading whole file.

I am completely lost trying to figure out what you're trying to do.

What OS and shell are you using?

You talk about input files, but you don't give us any indication of what is in those files.
You show us code that seems (if you're using bash or ksh) to be setting array variables file1 and file3 to arrays with one element (which is the string 1,2,3,4) and invoking the utility named file2 with one operand (which is the string =(1,2,3,4)).

You seem to have three inputs, but your output seems to contain four elements. Where did the 4th element come from?

Please give us a much clearer explanation of what you are trying to do!

i am using Linux and bash script. sorry it is my mistake. the output file should be

Code:

(1,1,1)