you guys are so helpful! Thanks. :-)~MIKE~(-: On Sun, Aug 24, 2014 at 7:40 PM, Jon Kettenhofen wrote: > I like visible proofs, so here's a test I ran: > (terminal output was as is shown) > > [jon@localhost ~]$ rm temp > [jon@localhost ~]$ echo >>temp > [jon@localhost ~]$ echo $? > 0 > [jon@localhost ~]$ cat temp > > [jon@localhost ~]$ echo >>temp 2>&1 > [jon@localhost ~]$ echo $? > 0 > [jon@localhost ~]$ cat temp > > > [jon@localhost ~]$ > > as you can see, no errors and the single ">" did not erase the file when > used in this manner. So Mike's script should work as intended > at least if there is no stderr output. > > but suppose there was an error? (apologizing for the length of ...) > > [jon@localhost ~]$ echo "echo" >test > [jon@localhost ~]$ echo "ls temp2" >>test > [jon@localhost ~]$ # test ls of non-existent file > [jon@localhost ~]$ ls temp2 > ls: cannot access temp2: No such file or directory > [jon@localhost ~]$ echo $? > 2 > [jon@localhost ~]$ # see, we get both an error and stderr message > [jon@localhost ~]$ # so > [jon@localhost ~]$ mv test test.sh > [jon@localhost ~]$ chgmod +x test.sh > bash: chgmod: command not found... > [jon@localhost ~]$ chmod +x test.sh > [jon@localhost ~]$ # i'm not perfect! > [jon@localhost ~]$ rm temp > [jon@localhost ~]$ ./test.sh >>temp > ls: cannot access temp2: No such file or directory > [jon@localhost ~]$ echo $? > 2 > [jon@localhost ~]$ cat temp > > [jon@localhost ~]$ ./test.sh >>temp 2>&1 > [jon@localhost ~]$ echo $? > 2 > [jon@localhost ~]$ cat temp > > > ls: cannot access temp2: No such file or directory > [jon@localhost ~]$ > > as you can see, Mike's script will work as he apparently intended, > providing he's using a modern version of bash. > > > > On 08/24/2014 09:56 PM, James Mcphee wrote: > >> you've said make, append stdout (default file descriptor 1) to file >> make.fail, assign stderr (default filedescriptor 2) the same >> filedescriptor as stdout. So... If the intent was to have both stderr >> and stdout append make.fail, then it is correct. >> >> >> On Sun, Aug 24, 2014 at 6:06 PM, Michael Havens > > wrote: >> >> what I really need to know is will this: >> >> make>>make.fail 2>&1 >> >> send stderr and stdout to the file 'make.fail' or did I write it >> incorrectly? >> >> :-)~MIKE~(-: >> >> >> On Sun, Aug 24, 2014 at 2:56 PM, Brian Cluff > > wrote: >> >> the > will delete any file that it points at even if the command >> doesn't actually output anything. It will even delete the file >> is the command doesn't exist like if you type grep as gerp >> >file, file will still be created/overwritten. >> >> If you want to make sure that your command doesn't overwrite any >> existing files you have to set the noclobber option like: >> $ set -o noclobber >> >> A good trick to know: >> You can use the > to delete the contents of a file without >> having to delete and recreate the file by simply doing this: >> $ >yourfile >> >> Brian Cluff >> >> >> On 08/24/2014 02:36 PM, Michael Havens wrote: >> >> I have a question about redirections: >> >> make>>make.fail 2>&1 >> >> tells it make and then to send (>) stderr (2) to stdout (1) >> and also to >> send stdout that way also (&1). finally all of that gets >> sent to a file >> named make.fail (>>). Isn't '>>' actually 'append' whereas >> '>' would >> work just as well so long as the file didn't already exist? >> If the file >> did exist would I get an error or would the file be >> overwritten? >> :-)~MIKE~(-: >> >> >> ------------------------------__--------------------- >> PLUG-discuss mailing list - >> PLUG-discuss@lists.phxlinux.__org >> >> >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/__mailman/listinfo/plug-discuss >> >> >> ------------------------------__--------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.__org >> >> >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/__mailman/listinfo/plug-discuss >> >> >> >> >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> >> >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> >> >> >> -- >> James McPhee >> jmcphe@gmail.com >> >> >> >> --------------------------------------------------- >> PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org >> To subscribe, unsubscribe, or to change your mail settings: >> http://lists.phxlinux.org/mailman/listinfo/plug-discuss >> >> > --------------------------------------------------- > PLUG-discuss mailing list - PLUG-discuss@lists.phxlinux.org > To subscribe, unsubscribe, or to change your mail settings: > http://lists.phxlinux.org/mailman/listinfo/plug-discuss >