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This is the command to search 'hello' in all c files recursively in current directory and subdirectories.
find ./ -name '*.c' -print | xargs grep 'hello' /dev/null
This is the command to find the string $B$ in all tex files recursively. The H option shows file name where the string is contained.
grep -HR '\$B\$' *.tex
To find all processes belong to user kwang
ps -Af | grep kwang

To find all .tex files in all subdirectories containing the pattern "cache oblivious":
grep -r "cache oblivious" --include '*.tex' *
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