How to add header file by script?

Question

I want to add a sentence to header of a file using bash script, I tried

echo "#define Block $i">>mypro.cpp

but it add '#define Block $i' to it's end. Thanks in advance

score 1 · Accepted Answer · edited May 23 '17 at 12:39

1

You can used sed :

[romano:~/tmp] % echo test >! test.c       
[romano:~/tmp] % sed -i -e "1i #include" test.c
[romano:~/tmp] % cat test.c 
#include
test

...just take care of the correct quoting.

More verbose: sed -i means to edit the file (the last argument) in place; the command "NiSomething" insert Something at line N.

PD this works on Linux and (GNU sed) 4.2.2 --- POSIX sed require a stricter syntax.

edited May 23 '17 at 12:39

Community

answered Oct 29 '14 at 11:41

Rmano

1

If you omit the address (the N in your example) doesn't it make the insertion before every line? – steeldriver Oct 29 '14 at 11:57
@steeldriver Oops, you're right. Corrected. Thanks. – Rmano Oct 29 '14 at 11:59
@Luminous --- if it worked for you please mark the question as answered, see http://askubuntu.com/help/someone-answers – Rmano Oct 29 '14 at 12:07

1 Answers1