Single command to create a file and set its permission

Question

I am using the following 2 commands to create a 0B file and set its extn to 644

touch filename.ext chmod 777 filename.txt 

My question is that whether there is any single command in unix (korn shell) that will do the two things together that is to say create a 0B fil with desired permission?

Answer 1

install -m 777 /dev/null filename.txt 

Answer 2

For bash, simply use chmod with file redirection and history expansion:

chmod 777 filename.txt>>!#:2 

For ksh and zsh you have to drop the history expansion (as shown above, there may be other ways) and use:

chmod 644 filename>>filename 

For scripts of any shell you don't have (and really don't need) history expansion so use the above there as well.