WebThere is a good chance that output redirection is the problem and that you're not getting anything through stdout, so try this instead: top -b 2>&1 grep "my_program" > top.log. Do note that you might have problems with output buffering aswell. Your shell won't constantly write to the file so it could take a while for top.log to fill. WebLinux Output Redirection. Output redirection is used to put output of one command into a file or into another command. > stdout. The stdout is redirected with a '>' greater than sign. When shell meets the '>' sign, it will clear the file (as you already know). Example:
Everything You Need to Know about Linux Input-Output Redirection
WebNov 21, 2024 · Method 1: Use redirection to save command output to file in Linux. You can use redirection in Linux for this purpose. With redirection operator, instead of showing the output on the screen, it goes to the provided file. The > redirects the command output to a file replacing any existing content on the file. WebJul 17, 2012 · In the first paragraph, you open a file and capture the file descriptor (it might well be 3) in the variable fd. You then duplicate the file descriptor over standard input (STDIN_FILENO). Note, though, that file descriptor 3 is still open. Then you do a dup(0) (which, for consistency, should be STDIN_FILENO), getting another file descriptor ... crosslink 2021
Linux Output Redirection - javatpoint
WebMar 1, 2024 · Redirection is a powerful feature of the Linux command line which is used to manage the input and output of commands by redirecting them to or from files into … Web2. Standard Input (stdin) Redirection. In Linux, cat command is used to print the content of a file. However, if cat command is executed without any input argument then by default it tries to read from the standard input (stdin) and because stdin is linked to the keyboard therefore it just waits for user to type something. WebNov 27, 2016 · cmd () { echo hello world! } To redirect the output from cmd to two files, but not to the console, you can use: cmd tee file1 file2 >/dev/null. This will work for multiple files, given any data source piping to tee: echo "foobarbaz" tee file1 file2 file3 file4 > /dev/null. This will also work: buick ottawa il