Login or Register to Ask a Question and Join Our Community

Sponsored Content
Full Discussion: Appending multiple files
Top Forums UNIX for Dummies Questions & Answers Appending multiple files Post 302943378 by Don Cragun on Friday 8th of May 2015 01:28:09 AM
Old 05-08-2015
The cat command that doesn't work for you is a UNIX command that would work just fine if you were executing it directly with a non-interactive shell script on any UNIX or Linux system. So, what you have told us is incorrect. We can give you an awk script that will do what cat does; we can give you a sed script that will do what cat does; we can give you a shell script that will do what cat does. But if cat doesn't work, we have absolutely no reason to think that an awk, ed, ex, more, less, sed, or shell script is going to work either.

If what you said about being able to execute the command:
Code:
cat /a/file1.txt /a/file2.txt /a/file3.txt /a/file4.txt > /a/file.txt

and it works fine except that it doesn't process the 2nd file operand is true, put in a dummy 2nd file operand and try again:
Code:
cat /a/file1.txt /this/operand/will/be/ignored /a/file2.txt /a/file3.txt /a/file4.txt > /a/file.txt

or:
Code:
cat /a/file1.txt /a/file2.txt /a/file2.txt /a/file3.txt /a/file4.txt > /a/file.txt

 

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Appending the two files

hi, I want to append to two files into a third file without new line like this: file 1: I am learning the unix file 2: Unix is very intersting When I am trying cat file1 file2 >> file3 I am getting: I am learning the unix Unix is very interesting But I want that to be in... (3 Replies)
Discussion started by: harish409
3 Replies

2. Shell Programming and Scripting

Appending same tring to multiple files in one line?

I have a string that I need to append to 3 files. Say, $ echo "Hello" I want to append this “Hello” to three files, file1, file2 and file3.The files are all in different directories and the file names have no common pattern.Can I do it in one line? If yes, how? :confused: (2 Replies)
Discussion started by: zombiezparadize
2 Replies

3. Shell Programming and Scripting

reversing and appending data in multiple files

Hello, I have a some files that look like this: 0 3 1 5 2 8 3 7 I want to reverse and append the data so it looks like this: 3 7 2 8 1 5 0 3 0 3 1 5 2 8 3 7 I first thought about using cat and tac cleverly with some redirection and pipe in a one-liner but I couldn't get it to... (1 Reply)
Discussion started by: bigfoot
1 Replies

4. UNIX for Dummies Questions & Answers

Help needed in Appending multiple lines

Hello, There is a log file A.log where new lines are getting added every minute. When ever any new lines are getting added in to A , the same lines needs to be appended to B.log I need to append these newly added lines to end of another file B through a shell script. I tried CAT but its... (2 Replies)
Discussion started by: twisterboy
2 Replies

5. Shell Programming and Scripting

Splitting record into multiple records by appending values from an input field (AWK)

Hello, For the input file, I am trying to split those records which have multiple values seperated by '|' in the last input field, into multiple records and each record corresponds to the common input fields + one of the value from the last field. I was trying with an example on this forum... (4 Replies)
Discussion started by: imtiaz99
4 Replies

6. Shell Programming and Scripting

Appending authorized_keys on multiple servers using ssh

Hi I have an ssh 'for' loop script to login and put a key on multiple servers. I need to append a file on each server but the command which works ok from the prompt does not work via the script. I have cat filename | ssh user@servername "cat >>append.file.name" I have tried to 'spawn' this in... (0 Replies)
Discussion started by: Grueben
0 Replies

7. Shell Programming and Scripting

Copying multiple files and appending time stamp before file extension

Hi, I have multiple files that read: Asa.txt Bad.txt Gnu.txt And I want to rename them using awk to Asa_ddmmyytt.txt and so on ... If there is a single command or more efficient executable please share! Thanks! (4 Replies)
Discussion started by: Jesshelle David
4 Replies

8. UNIX for Beginners Questions & Answers

Appending time stamp for multiple file

Hi All, I am trying to append time stamp to all file with wild character. If you look above I want take all file with wild card *001* and append current time stamp to it. I did below code. But not sure if there is any easy way that can be done in a single step a=date +%s for... (3 Replies)
Discussion started by: arunkumar_mca
3 Replies

9. Shell Programming and Scripting

Appending multiple files through UNIX

Hi All, I have requirement where multiple csv files are present in a directory and each file contains a header.I need to append the contents of all the files into one file by removing header. Once the data is merged in one file ,I need to remove duplicates on nth column to find out distinct... (2 Replies)
Discussion started by: STCET22
2 Replies

10. Shell Programming and Scripting

Appending different columns of multiple files in awk

Hello All, I have three input files cat file1 col1|col2|col3 a|1|A b|2|B cat file2 col1|col2|col3 c|3|C cat file3 col1|col2|col3 d|4|D e|5|E i want below output file4 col1|col2 a|1 (6 Replies)
Discussion started by: looney
6 Replies

LEARN ABOUT V7

diff3

DIFF3(1)						      General Commands Manual							  DIFF3(1)

NAME

       diff3 - 3-way differential file comparison

SYNOPSIS

       diff3 [ -ex3 ] file1 file2 file3

DESCRIPTION

       Diff3 compares three versions of a file, and publishes disagreeing ranges of text flagged with these codes:

       ====	       all three files differ

       ====1	       file1 is different

       ====2	       file2 is different

       ====3	       file3 is different

       The type of change suffered in converting a given range of a given file to some other is indicated in one of these ways:

       f : n1 a        Text is to be appended after line number n1 in file f, where f = 1, 2, or 3.

       f : n1 , n2 c   Text is to be changed in the range line n1 to line n2.  If n1 = n2, the range may be abbreviated to n1.

       The original contents of the range follows immediately after a c indication.  When the contents of two files are identical, the contents of
       the lower-numbered file is suppressed.

       Under the -e option, diff3 publishes a script for the editor ed that will incorporate into file1 all changes between file2 and file3,  i.e.
       the  changes  that  normally  would  be	flagged ==== and ====3.  Option -x (-3) produces a script to incorporate only changes flagged ====
       (====3).  The following command will apply the resulting script to `file1'.

		(cat script; echo '1,$p') | ed - file1

FILES

       /tmp/d3?????
       /usr/lib/diff3

SEE ALSO

       diff(1)

BUGS

       Text lines that consist of a single `.' will defeat -e.
       Files longer than 64K bytes won't work.

																	  DIFF3(1)
All times are GMT -4. The time now is 06:52 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy