linux tee command – read from standard input and write to standard output and files.
Copy standard input to each FILE, and also to standard output.
tee [OPTION]... [FILE]...
- -a, –append
append to the given FILEs, do not overwrite
- -i, –ignore-interrupts
ignore interrupt signals
diagnose errors writing to non pipes
set behavior on write error.
MODE determines behavior with write errors on the outputs:
diagnose errors writing to any output
diagnose errors writing to any output not a pipe
exit on error writing to any output
exit on error writing to any output not a pipe
Examples & Use Cases
Output to standard output and save to file
When we execute linux commands, sometimes we need to save the output to a file and print the output to standard output.
This is the tee command we can use.
➜ ping www.linuxcommands.site | tee ping.log
Output to standard output and append to file
Append output to existing file using tee command “-a” option
➜ ping www.google.com | tee -a ping.log
Output to standard output and output to multiple files
➜ ping www.google.com | tee ping.log g.log
Print stderr and stdout and save to file
Redirect stderr to stdout and use the tee command through the pipeline to save the file and print the information
➜ ./scrip.sh 2>&1 | tee output.log
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