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How can I use a file in a command and redirect output?
Basically I want to take as input text from a file, remove a line from that file, and send the output back to the same file. Something along these lines if that makes it any clearer. grep -v ‘seg[0-9]\\{1,\\}\\.[0-9]\\{1\\}’ file_name > file_name however, when I do this I end up with a blank file. Any thoughts? bashredirectio Share
How to replace a string in all files?
Example: I want to replace every occurrence of www.fubar.com with www.fubar.ftw.com in every file under my current directory. You’re on the right track, use find to locate the files, then sed to edit them, for example: The . means current directory – i.e. in this case, search in and below the current directory.
How to replace a string with another string in Bash?
The -exec option is followed by the command to be applied to the files found, and is terminated by a semicolon, which must be escaped, otherwise the shell consumes it before it is passed to find. Thanks for contributing an answer to Stack Overflow!
How are redirection operators processed in the shell?
Redirections are processed in the order they appear, from left to right. < : Gives input to a command. If the file doesn’t exist, it will be created. That operator is rarely used because commands generally only read from their stdin, though it can come handy in a number of specific situations.
How to redirect a handle to another stream?
However, while in CMD you can redirect any handle to any other handle ( 3>&2, 1>&5.), PowerShell redirection only supports redirection to either a file ( 3>C:\\out.txt) or the success output stream ( 3>&1 ). Trying to redirect to any other stream will throw an error:
How to redirect output streams in PowerShell?
In Powershell, we can combine the standard output stream with any other stream and then redirect (write) the result to the same file. Suppose I use Write-Error and Write-Warning statements in myscript.ps1 and I want to write only the errors and the warnings to the same file.
Is there a way to redirect PowerShell output to a text file?
By default, PowerShell sends output to the PowerShell host. Usually this is the console application. However, you can direct the output to a text file, and you can redirect error output to the regular output stream. Use the Out-File cmdlet, which sends command output to a text file.
When do you use redirection operators in PowerShell?
Use the PowerShell redirection operators. The redirection operators enable you to send streams of data to a file or the Success output stream. The PowerShell redirection operators use the following numbers to represent the available output streams: There is also a Progress stream in PowerShell, but it is not used for redirection.
Are there any redirection operators that do not overwrite data?
Ignore Inquire The redirection operators that do not append data ( > and n>) overwrite the current contents of the specified file without warning. However, if the file is a read-only, hidden, or system file, the redirection fails.