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bash redirect stdout and stderr to the same file
# Basic syntax:
command &> output_and_error_file
# Note, in Bash and other Linux shells, when a program is executed, it
# uses one of three standard I/O streams. Each stream is represented
# by a numeric file descriptor:
# - 0, or stdin, the standard input stream
# - 1, or stdout, the standard output stream
# - 2, or stderr, the standard error stream
# By default the ">" operator uses 1 and is equivalent to "1>"
# Example uses:
# Redirect the standard error to a specific file:
command 2> error_file
# Redirect the standard output and standard error to different files:
command 1> output_file 2> error_file
Source: linuxize.com
bash how to append stdout to a file
# Basic syntax:
command >> output_file # Append stdout to output_file
# Note, use > to overwrite file contents and >> to append to a file
# Note, if the output_file doesn't exist, it will be created
Source: stackoverflow.com
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