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Top Forums UNIX for Beginners Questions & Answers How to comment a specific line of a file in Solaris 10? Post 303042675 by MadeInGermany on Friday 3rd of January 2020 05:43:14 AM
Old 01-03-2020
The following is a "safe" use of a tmp file - the && only on success will continue with the following command, and the cp leaves the inode/owner/group/permissions/linkage intact.
Code:
file=abc.txt
ftmp=$file.tmp.$$
sed '3s/^/#/' $file >$ftmp &&
cp $ftmp $file &&
rm $ftmp

Or use perl - like sed it will alter inode and linkage.
Code:
perl -i -pe '$.==3 and s/^/#/' abc.txt

 

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PERLDGUX(1)						 Perl Programmers Reference Guide					       PERLDGUX(1)

NAME
perldgux - Perl under DG/UX. SYNOPSIS
One can read this document in the following formats: man perldgux view perl perldgux explorer perldgux.html info perldgux to list some (not all may be available simultaneously), or it may be read as is: as README.dgux. DESCRIPTION
Perl 5.7/8.x for DG/UX ix86 R4.20MU0x BUILDING PERL ON DG
/UX Non-threaded Perl on DG/UX Just run ./Configure script from the top directory. Then give "make" to compile. Threaded Perl on DG/UX If you are using as compiler GCC-2.95.x rev(DG/UX) an easy solution for configuring perl in your DG/UX machine is to run the command: ./Configure -Dusethreads -Duseithreads -Dusedevel -des This will automatically accept all the defaults and in particular /usr/local/ as installation directory. Note that GCC-2.95.x rev(DG/UX) knows the switch -pthread which allows it to link correctly DG/UX's -lthread library. If you want to change the installation directory or have a standard DG/UX with C compiler GCC-2.7.2.x then you have no choice than to do an interactive build by issuing the command: ./Configure -Dusethreads -Duseithreads In particular with GCC-2.7.2.x accept all the defaults and *watch* out for the message: Any additional ld flags (NOT including libraries)? [ -pthread] Instead of -pthread put here -lthread. CGCC-2.7.2.x that comes with the DG/UX OS does NOT know the -pthread switch. So your build will fail if you choose the defaults. After configuration is done correctly give "make" to compile. Testing Perl on DG/UX Issuing a "make test" will run all the tests. If the test lib/ftmp-security gives you as a result something like lib/ftmp-security....File::Temp::_gettemp: Parent directory (/tmp/) is not safe (sticky bit not set when world writable?) at lib/ftmp-security.t line 100 don't panic and just set the sticky bit in your /tmp directory by doing the following as root: cd / chmod +t /tmp (=set the sticky bit to /tmp). Then rerun the tests. This time all must be OK. Installing the built perl on DG/UX Run the command "make install" AUTHOR
Takis Psarogiannakopoulos University of Cambridge Centre for Mathematical Sciences Department of Pure Mathematics Wilberforce road Cambridge CB3 0WB , UK email <takis@XFree86.Org> SEE ALSO
perl(1). perl v5.16.2 2012-10-11 PERLDGUX(1)
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