Name
sed
Synopsis
sed '[address1
][,address2
]s/pattern
/replacement
/[flags
]'files
sed -fscript
files
By default, sed applies the substitution to
every line in files
. Each address can be
either a line number or a regular expression pattern. A supplied
regular expression must be defined within the forward slash
delimiters (/..
.). If
address1
is supplied, substitution will
begin on that line number or the first matching line, and continue
until either the end of the file or the line indicated or matched by
address2
.
Two subsequences, &
and
\
n
, will be interpreted
in replacement
based on the results of the
match. The sequence &
is replaced with the
text matched by pattern
. The sequence
\
n
corresponds to a
capture group (1..9) in the current match.
The available flags are:
n
Substitute the
n
th match in a line, wheren
is between 1 and 512.g
Substitute all occurrences of
pattern
in a line.p
Print lines with successful substitutions.
w
file
Write lines with successful substitutions to
file
.
Example
Change date formats from MM/DD/YYYY to DD.MM.YYYY.
$ echo 12/30/1969' | sed 's!\([0-9][0-9]\)/\([0-9][0-9]\)/\([0-9]\{2,4\}\)!\2.\1.\3!g'
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