I want to get value inside </em>4,519</a> tag via shell script anyone please help how can do that?
id='idusedMemory' alt='graph'/></em>4,519</a> Mb / 64,309 Mb </td><td>
CodePudding user response：
Using grep that supports/has the -P flag.
grep -Po '(?<=</em>).*(?=</a>)' file
or
echo 'id='idusedMemory' alt='graph'/></em>4,519</a> Mb / 64,309 Mb </td><td>' | grep -Po '(?<=</em>).*(?=</a>)'
As what was suggested in the comments, don't parse html/xml with such tools. Use a tool/utility for parsing such files.
CodePudding user response：
Just use grep with the -o switch in order only to show that information:
grep -o "</em>.*</a>" test.txt
.* stands for any number of any character.
CodePudding user response：
If your HTML string containing only one substring like that, you can use regexp and sed:
echo "id='idusedMemory' alt='graph'/></em>4,519</a> Mb / 64,309 Mb </td><td>" | sed -rn 's@^.*</em>(.*)</a>.*$@\1@p'
Output:
4,519
If you have something more complicated, you may want to check parsing XML in bash. E.g., here.
Hope that helps.