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Top Forums UNIX for Dummies Questions & Answers write new line at the beginning of an existing file Post 302255552 by jim mcnamara on Thursday 6th of November 2008 04:32:55 PM
Old 11-06-2008
Code:
echo "1i\nthis is the line that u wanted to insert \n.\nwq" | ex -s filename

echo "string...." ex -s filename means to invoke the ed (or vi) editor thru the ex program. -s means "silent" do not give responses.

1i\n = goto line 1 go into insert mode add a new line then insert the text
\n.\nwq - add a newline at the end of the text, then write the changes to the file and quit.

Most people don't necessarily view this as easier than some other more "scripty" ways.
 

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line(1) 						      General Commands Manual							   line(1)

NAME
line - Reads one line from standard input SYNOPSIS
line STANDARDS
Interfaces documented on this reference page conform to industry standards as follows: line: XCU5.0 Refer to the standards(5) reference page for more information about industry standards and associated tags. OPTIONS
None DESCRIPTION
The line command copies one line, up to and including a newline, from standard input and writes it to standard output. Use this command within a shell command file to read from your terminal. The line command always writes at least a newline character. NOTES
The line utility has no internationalization features and is marked LEGACY in XCU Issue 5. Use the read utility instead. EXIT STATUS
Success. End-of-File. EXAMPLES
To read a line from the keyboard and append it to a file, enter: echo 'Enter comments for the log:' echo ': c' line >>log This shell procedure displays the message: Enter comments for the log: It then reads a line of text from the keyboard and adds it to the end of the file log. The echo ': c' command displays a : (colon) prompt. See the echo command for information about the c escape sequence. SEE ALSO
Commands: echo(1), ksh(1), read(1), Bourne shell sh(1b), POSIX shell sh(1p) Functions: read(2) Standards: standards(5) line(1)
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