05-03-2013
sed insert new line does not update file
Hi all,
I have a file called "text.cpp" with the first line of "1"
afterwards I tried in Ubuntu to type the following
sed '12iasdasdasdasdsad' test.cpp > output.txt
however when I tried to see the result of output.txt
#cat output.txt
1
why is the line 12 is not updated to the new output.txt?
thank you
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CPP(1) General Commands Manual CPP(1)
NAME
cpp - C language preprocessor
SYNOPSIS
cpp [ option ... ] [ ifile [ ofile ] ]
DESCRIPTION
Cpp interprets ANSI C preprocessor directives and does macro substitution. The input ifile and output ofile default to standard input and
standard output respectively.
The options are:
-Dname
-Dname=def
-Idir Same as in 2c(1).
-M Generate no output except a list of include files in a form suitable for specifying dependencies to mk(1). Use twice to list files
in angle brackets.
-N Turn off default include directories. All must be specified with -I. Without this option, /$objtype/include and /sys/include are
used as the last two searched directories for include directives, where $objtype is read from the environment.
-V Print extra debugging information.
-+ Understand C++ comments.
The output file contains processed text sprinkled with lines that show the original input line numbering:
#line linenumber "ifile"
The input language is as described in the ANSI C standard. The C compilers do not use cpp; they contain their own simple but adequate pre-
processor, so cpp is usually superfluous.
FILES
/sys/include
directory for machine-independent include files
/$objtype/include
directory for machine-dependent include files
SOURCE
/sys/src/cmd/cpp
SEE ALSO
2c(1)
CPP(1)