WebJan 7, 2009 · Hi all, I've been working on a bash script to help with backups that I have to do at work. One of the lines in the script is supposed to launch an xterm, log into a specific server node and launch a tar backup to tape. WebYou have to redirect stdout first before duplicating it into stderr; if you duplicate it first, stderr will just point to what stdout originally pointed at. Bash, zsh and some other shells also provide the shortcut ls good bad &>/dev/null which is convenient on the command-line but should be avoided in scripts which are intended to be portable.
How to redirect shell command output Enable Sysadmin
WebMar 5, 2024 · The dd (1) command prints to stderr, not stdout. That's why the first redirection didn't output anything to the file. dd if=/dev/zero of=/dev/null bs=512 count=4096 >& file. Code: > name >! name >& name >&! name The file name is used as standard output. If the file does not exist then it is created; if the file exists, it is truncated, its ... WebMay 25, 2024 · The > operator redirects the output usually to a file but it can be to a device. You can also use >> to append. If you don't specify a number then the standard output stream is assumed, but you can also redirect errors: > file redirects stdout to file 1> file redirects stdout to file 2> file redirects stderr to file campground black hills
unix - Redirect not working correctly, 2> /dev/null becomes 2 > …
WebJun 18, 2024 · Replace commands with redirection syntax, for example: ksh -c 'ls -l foo 2> ~/notfound' At Indiana University, for personal or departmental Linux or Unix systems support, see Get help for Linux or Unix at IU . WebApr 22, 2015 · I'm running into issues with redirection in tcsh. Consider the following commands: vi --version and vi --xxx. And let's assume this is on a machine where vi supports the --version option. The option --xxx is invalid, and therefore vim should display something via stderr. Web我正在做一個項目,要求我在C程序的迷你外殼中具有輸出才能輸出到文件。 使用./program > file.txt將不起作用 。. 我有一個運行小命令的小型外殼程序,我想這樣做,以便當某人在命令末尾有一個> filename時,它將所有文本從printf()重定向到文件,而不是控制台,然后將其重定向回控制台。 first time buyer scheme isle of man