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I have a file containing hundreds of values that start with $.
$ cat /tmp/file
$one $t $three
$one $t $three $t $three
I'm trying to use sed to replace only the values that start with $t.
$ sed "s/\$t/foo/g" /tmp/file
$one foo foohree
$one foo foohree foo foohree
But the above command replaces the $three values as well. How can I prevent this?
try:
sed "s/\$t\>/foo/g" /tmp/file
\> is a regular expression pattern match for the end of the word.
Tried with below sed and awk command
awk '{for(i=1;i<=NF;i++){if($i =="$t"){gsub(/\$t/,"foo",$i)}}}1' filename
sed command
sed "s/\$t /foo /g" filename
output
$one foo $three
$one foo $three foo $thre
e
') to quote regular expressions on the command line. Typical shells turn"\$"(with double quotes) into the literal$which is a meta-character for the end-of-string in sed regular expressions. It just so happens that sed interprets it as a literal$if it occurs at the beginning of a regular expression literal. However, if you write'\$', it becomes\$and sed will know that you want to match the literal$character (and not end-of-string) regardless of its position in the regular expression. – David Foerster Aug 8 '20 at 7:23