please notice that the string appended to grep command should be piple or file name, should not be just a string.
of course you can exploit the temp file for your resolution as possible as you can.
dos copy --> right click
Below is an example:
1 #!/bin/bash
2
3 #----------------------------------------------------------------
4 # This script is used to extract the methods of the java class
5 #-----------------------------------------------------------------
6 cat java.java | while read line
7 do
8 #echo $line > temp.txt
9 #grep "public class" temp.txt >> result.txt
10 #grep "public.*{" temp.txt >> result.txt
11 #grep "private.*{" temp.txt >> result.txt
12 #rm temp.txt
13
14 if [[ -n `echo $line | grep "public class"` ]]
15 then
16 echo $line >> result.txt
17 elif [[ -n `echo $line | grep "public.*{"` ]]
18 then
19 echo $line >> result.txt
20 elif [[ -n `echo $line | grep "private.*{"` ]]
21 then
22 echo $line >> result.txt
23 else
24 echo hello
25 continue
26 fi
27 done
2
3 #----------------------------------------------------------------
4 # This script is used to extract the methods of the java class
5 #-----------------------------------------------------------------
6 cat java.java | while read line
7 do
8 #echo $line > temp.txt
9 #grep "public class" temp.txt >> result.txt
10 #grep "public.*{" temp.txt >> result.txt
11 #grep "private.*{" temp.txt >> result.txt
12 #rm temp.txt
13
14 if [[ -n `echo $line | grep "public class"` ]]
15 then
16 echo $line >> result.txt
17 elif [[ -n `echo $line | grep "public.*{"` ]]
18 then
19 echo $line >> result.txt
20 elif [[ -n `echo $line | grep "private.*{"` ]]
21 then
22 echo $line >> result.txt
23 else
24 echo hello
25 continue
26 fi
27 done