Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

Insert content of a file into another file before given pattern

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Insert content of a file into another file before given pattern
# 1  
Old 05-02-2015
Insert content of a file into another file before given pattern
I need to insert file x2 into x1 right before first BBB line.
Code:
$ cat x1
AAA     1
AAA     2
AAA     3
BBB     1
BBB     2
BBB     3
$ cat x2
XXX - insert 1
XXX - insert 2

I need to get
Code:
AAA     1
AAA     2
AAA     3
XXX - insert 1
XXX - insert 2
BBB     1
BBB     2
BBB     3

I tried
a)
Code:
$ sed -n '1,/^BBB/p' x1; cat x2; sed -n '/^BBB/,$p' x1
AAA     1
AAA     2
AAA     3
BBB     1
XXX - insert 1
XXX - insert 2
BBB     1
BBB     2
BBB     3

and
b)
Code:
$ sed -e '/^BBB/r x2' x1                                     
AAA     1
AAA     2
AAA     3
BBB     1
XXX - insert 1
XXX - insert 2
BBB     2
XXX - insert 1
XXX - insert 2
BBB     3
XXX - insert 1
XXX - insert 2

Both have problems, (a) inserts after BBB and it duplicates the BBB line, the (b) repeatedly inserts the content and does it again after.

Any ideas?
# 2  
Old 05-02-2015
I usually find ed better suited for things like this than sed. Try:
Code:
#!/bin/ksh
ed -s x1 <<-EOF
	H
	/BBB/-1r x2
	w somefile
	q
EOF

The ed H command will give you a semi-useful diagnostic if the pattern you're looking for is not present in the input file.

This will save the updated contents in a file name somefile. If you want to update x1 instead of creating a new file; change:
Code:
	w somefile

to just:
Code:
	w

If you want the update written to standard output instead of to a file, change the lines:
Code:
	w somefile
	q

to:
Code:
	,p
	Q

This User Gave Thanks to Don Cragun For This Post:
migurus
# 3  
Old 05-03-2015
With awk:
Code:
awk '!p && /^BBB/{while((getline ins<f)>0) print ins; p=1}1' f=x2 x1

or simply
Code:
awk '/^BBB/{while((getline p<f)>0) print p}1' f=x2 x1

which should also work since additional reads after will fail after the insert file will have been read, but not closed at the first occurrence of ^BBB
Last edited by Scrutinizer; 05-03-2015 at 05:51 AM..
Login or Register to Ask a Question

Previous Thread | Next Thread

9 More Discussions You Might Find Interesting

1. UNIX for Beginners Questions & Answers

Insert content from file 1 to file 2 in specific criteria meet

Hi , I'm looking for some code that can copy and paste form file1 to file2 with 2 criterial meet. file1: test "sp-j1" test "sp-j2" test "sp-j3" test "sp-j4" file2: sub Pre_Shorts1 (Status_Code, Message$) global Status !if Message$ <> "" then print... (3 Replies)
Discussion started by: kttan
3 Replies

2. Shell Programming and Scripting

Insert content of a file right after pattern in another file

suppose i have original file: original.txt: hello how are you you are wonderful what time is it I went to the store last night. and some apple juice then i have another file: anotherfile.txt: with my friends mary, john and harry. We had a great time. We bought food Suppose... (1 Reply)
Discussion started by: SkySmart
1 Replies

3. Shell Programming and Scripting

Insert content of file before the first occurrence of a line starts with a pattern in another file

Hi all, I'm new to scripting.. facing some problems while inserting content of a file into another file... I want to insert content of a file (file2) into file1, before first occurrence of "line starts with pattern" in file1 file1 ====== working on linux its unix world working on... (14 Replies)
Discussion started by: Jagadeesh Kumar
14 Replies

4. Shell Programming and Scripting

Insert content of a file to another file at a line number which is given by third file

Hi friends, here is my problem. I have three files like this.. cat file1.txt ======= unix is best unix is best linux is best unix is best linux is best linux is best unix is best unix is best cat file2.txt ======== Windows performs better Mac OS performs better Windows... (4 Replies)
Discussion started by: Jagadeesh Kumar
4 Replies

5. UNIX for Dummies Questions & Answers

How to append portion of a file content to another file when a certain pattern is matching?

Hi ladies and gentleman.. I have two text file with me. I need to replace one of the file content to another file if one both files have a matching pattern. Example: text1.txt: ABCD 1234567,HELLO_WORLDA,HELLO_WORLDB DCBA 3456789,HELLO_WORLDE,HELLO_WORLDF text2.txt: XXXX,ABCD... (25 Replies)
Discussion started by: bananamen
25 Replies

6. Shell Programming and Scripting

Want to Insert few lines which are stored in some file before a pattern in another file

Hello, I have few lines to be inserted in file_lines_to_insert. In another file final_file, I have to add lines from above file file_lines_to_insert before a particular pattern. e.g. $ cat file_lines_to_insert => contents are abc def lkj In another file final_file, before a... (6 Replies)
Discussion started by: nehashine
6 Replies

7. Shell Programming and Scripting

Insert content of a file after a certain line in another file

Hi, it's my first post to this forum. I just started bash and I'm stuck at one issue. I want to include content of a file in another file after a certain line. I'm using sed for inserting one line but how to insert all content of a file ? For example i have a file list.txt with a few lines and... (4 Replies)
Discussion started by: ktm
4 Replies

8. Shell Programming and Scripting

extract content from a file and insert to another file

please help for the following task... I have to extract the mac address & IP address from the file1: ... 0100004512EEF4 03 192.168.0.7 192.168.0.1 -1 ... 0100779hF5D212 03 192.168.0.8 192.168.0.1 -1 ... 0100789lF5D212 03 192.168.0.9 192.168.0.1 -1 ... ... change the format (addidng... (15 Replies)
Discussion started by: fredao
15 Replies

9. Shell Programming and Scripting

Insert file content via sed after two searchings

Hi folks, The file webcache.xml contains a lot sections which begins and ends with the string </CACHEABILITYRULE>. The section In need to deel with is: </CACHEABILITYRULE> <CACHEABILITYRULE NAME="cache swf" CACHE="YES" COMMENT="This rule caches all .swf files. This... (2 Replies)
Discussion started by: nir_s
2 Replies
Login or Register to Ask a Question