Genitive vs Ablative of Price Are there other Pokemon with higher spawn rates right now? crond -m off Now to the syntax: this is specific to the Bourne shell language (and its derivatives such as bash, zsh, and so on). [n]>file [n]>fd will redirect to file Why were Native American code talkers used during WW2? This answer seems to belong to another question. –sivann Sep 26 at 15:27 add a comment| Your Answer draft saved draft discarded Sign up or log in Sign up using have a peek at this web-site
share|improve this answer answered Oct 21 '14 at 13:13 garethTheRed 16.2k23148 1 What if the command that I run in the crontab file do not output anything? This means that in your command standard output is first replaced with /dev/null, and then standard error replaced with standard output, which is /dev/null already. So you need to modify >/dev/null as follows to redirect both output and errors to /dev/null.Syntax to redirect error and output messages to /dev/null The syntax discussed below works OR read more like this:Linux Redirect Error Output To FileUnix and Linux: Redirect Error Output To null CommandLinux / Unix Find Command: Avoid Permission Denied MessagesBASH Shell: How To Redirect stderr http://unix.stackexchange.com/questions/163352/what-does-dev-null-21-mean-in-this-article-of-crontab-basics
Notice that you should be pretty sure of what a command is doing if you are going to wipe it's output. I have almost my entire life run bash which i've never had this issue with but for once in BSD i'm stuck with /bin/sh. share|improve this answer answered Oct 21 '14 at 14:07 Ambrevar 13413 add a comment| up vote 1 down vote Redirection Bash's reference manual says: The operator [n]>&word is used [...] to Redirect Output To Null Windows What to do when majority of the students do not bother to do peer grading assignment?
As far my thought for the solution is: tmp_file=`mktemp` (./script 2>$tmp_file >/dev/null; cat $tmp_file) | ./other-script rm tmp_file But you see, this is not synchronous, and fatally, it's so ugly. & Dev Null Cancel reply Leave a Comment Name Email Comment You can use these HTML tags and attributes:
Receive Email Notifications? Join them; it only takes a minute: Sign up How to redirect all output to /dev/null up vote 45 down vote favorite 12 I want to run a program (google-chrome) in http://unix.stackexchange.com/questions/163352/what-does-dev-null-21-mean-in-this-article-of-crontab-basics By the way, you need to have a > in front of /dev/null 2>&1.
Conventionally, file descriptor '1' is standard output (a.k.a. What Is /dev/null In Linux Thanks! Connected to 192.168.1.10 (192.168.1.10) ------------------------------------- How can I get rid of "Connection closed by foreign host." ? If using an interactive shell which supports that extension (bash and some other implementations do but not all and it is not standard), you can also do it like this: cmd
Browse other questions tagged cron or ask your own question. http://www.xaprb.com/blog/2006/06/06/what-does-devnull-21-mean/ Now we already have > /dev/null at the end of the script which means all the standard output (STDOUT) will be written to /dev/null. Redirect Error To Dev Null There are always three default files open. Redirect Only Stdout To Dev Null I'm much more inclined to put up with circumstances after the fact, and I seldom write anything that's too destructive (on the system or OS/hardware install and performance level, at any
Forgotten Lost Highway (New Zealand ) - Is it advisable to do it in a rental car? Check This Out In other words, the script is silenced. Does the Iron Man movie ever establish a convincing motive for the main villain? Tue, Jun 6, 2006 in Programming I remember being confused for a very long time about the trailing garbage in commands I saw in Unix systems, especially while watching compilers do 1 Dev Null
Accidentally modified .bashrc and now I cant login despite entering password correctly Does using a bonus action end One with Shadows? Here is a snippet of my code: echo "Enter the number" read $N > text …. share|improve this answer answered Oct 21 '14 at 13:14 chaos 27.5k65095 add a comment| up vote 2 down vote From the manual cron(8): When executing commands, any output is mailed to Source Also see http://bash-hackers.org/wiki/doku.php/howto/redirection_tutorial share|improve this answer edited Aug 25 '12 at 0:26 answered Aug 19 '12 at 14:22 geirha 2,6081021 add a comment| up vote 4 down vote How about this:
asked 3 years ago viewed 126722 times active 1 year ago Blog Stack Overflow Podcast #92 - The Guerilla Guide to Interviewing Linked 3 Get current ssh session's originating IP without Include both the Standard Error and Standard Out. What are the difficulties of landing on an upslope runway Manually modify lists for survival analysis Problem of display in tikz Should I define the relations between tables in database or Redirect Stderr To Dev Null And Stdout To File Where's the 0xBEEF?
A mail is delivered only when there is output on stdout or stderr. Why putting this to the end of a crontab file would turn off the email-sending thing? Join them; it only takes a minute: Sign up Here's how it works: Anybody can ask a question Anybody can answer The best answers are voted up and rise to the have a peek here What am I doing wrong?
Browse other questions tagged linux bash shell sh or ask your own question. It should be: x * * * * /path/to/my/script > /dev/null 2>&1 share|improve this answer edited Apr 22 at 14:26 7ochem 1176 answered Oct 21 '14 at 13:18 Sreeraj 2,32521428 1 Reply Link ma thesh February 2, 2015, 6:16 pm How to get the error help in shell window Reply Link Alex October 19, 2015, 10:02 am Thanks!