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The sed command can be used to replace an entire line with a new line. The "c" command to sed tells it to change the line. The sed command can be used to convert the lower case letters to upper case letters by using the transform "y" option.
\b marks a word boundary, either beginning or end. Now consider \b' . This matches a word boundary followed by a ' . Since ' is not a word character, this means that the end of word must precede the ' to match.
\b in regular expressions match word boundaries (i.e. the location between the first word character and non-word character):
$ echo "bar embarassment" | sed "s/\bbar\b/no bar/g"
no bar embarassment
On Mac OS X, neither of these regex syntaxes work inside sed for matching whole words
\bmyWord\b\<myWord\>Hear me now and believe me later, this ugly syntax is what you need to use:
/[[:<:]]myWord[[:>:]]/So, for example, to replace mint with minty for whole words only:
sed "s/[[:<:]]mint[[:>:]]/minty/g"Source: re_format man page
Use \b for word boundaries:
sed -i 's/\boldtext\b/newtext/g' <file>
In one of my machine, delimiting the word with "\b" (without the quotes) did not work. The solution was to use "\<" for starting delimiter and "\>" for ending delimiter.
To explain with Joakim Lundberg's example:
$ echo "bar embarassment" | sed "s/\<bar\>/no bar/g"
no bar embarassment
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