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This is the command I'm using on a standard web page I wget from a web site.
tr '<' '\n<' < index.html
however it giving me newlines, but not adding the left broket in again. e.g.
echo "<hello><world>" | tr '<' '\n<'
returns
(blank line which is fine)
hello>
world>
instead of
(blank line or not)
<hello>
<world>
What's wrong?
571
Find and replace text within a file using sed command Use Stream EDitor (sed) as follows: sed -i 's/old-text/new-text/g' input.txt. The s is the substitute command of sed for find and replace. It tells sed to find all occurrences of 'old-text' and replace with 'new-text' in a file named input.txt.
`tr` command can be used with -c option to replace those characters with the second character that don't match with the first character value. In the following example, the `tr` command is used to search those characters in the string 'bash' that don't match with the character 'b' and replace them with 'a'.
Though most common use of SED command in UNIX is for substitution or for find and replace. By using SED you can edit files even without opening them, which is much quicker way to find and replace something in file, than first opening that file in VI Editor and then changing it.
It can be used with UNIX pipes to support more complex translation. tr stands for translate. -d : delete characters in the first set from the output. To convert from lower case to upper case the predefined sets in tr can be used.
That's because tr only does character-for-character substitution (or deletion).
Try sed instead.
echo '<hello><world>' | sed -e 's/</\n&/g'
Or awk.
echo '<hello><world>' | awk '{gsub(/</,"\n<",$0)}1'
Or perl.
echo '<hello><world>' | perl -pe 's/</\n</g'
Or ruby.
echo '<hello><world>' | ruby -pe '$_.gsub!(/</,"\n<")'
Or python.
echo '<hello><world>' \
| python -c 'for l in __import__("fileinput").input():print l.replace("<","\n<")'
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