How to grep a string in a binary file?
Answer:
Assume you have a binary file "foo.bin", you can combine strings with the grep command.
strings foo.bin | grep bar
Jan 052010
Jan 072009
Remove empty lines in a file
Answer
Pick any one of the following methods.
1. grep
grep . test.txt
2. sed
sed '/^$/d' test.txt
3. awk
awk NF test.txt
4. tr
cat test.txt | tr -s "\n"
5. perl
perl -n -e 'print unless /^$/' test.txt
