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Examples
Invocation of ed
bash$ ed textfile.txt < commandfile
bash$ ed textfile.txt <<EOF
a
This is now the last line.
.
wq
EOF
Inserts a line at the end of a file (the initial position is the last line).
A single period exits from
insert
mode
The notation "<<
string
\n...\n
string
": here-document of the shell