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add information about input, output, and error redirection

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alexandre medeiros
2013-09-22 11:04:24 -03:00
parent 9d0f731ad5
commit 9c8c0af0af
1 changed files with 7 additions and 0 deletions
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@@ -86,6 +86,13 @@ ls -l # Lists every file and directory on a separate line
# txt files in the current directory: # txt files in the current directory:
ls -l | grep "\.txt" ls -l | grep "\.txt"
# You can also redirect a command output, input and error output.
python2 hello.py < "input.in"
python2 hello.py > "output.out"
python2 hello.py 2> "error.err"
# The output error will overwrite the file if it exists, if you want to
# concatenate them, use ">>" instead.
# Commands can be substitued within other commands using $( ): # Commands can be substitued within other commands using $( ):
# The following command displays the number of files and directories in the # The following command displays the number of files and directories in the
# current directory. # current directory.