shell pipeline

# Basic Shell cmd:
ctrl + r
ctrl + a / ctrl + e
ctrl + c
ctrl + w
ctrl + p / ctrl + n
tab-tab

# Useful tool
grep
find
ls
awk
sed
less

$ ls | xargs -n 1 | file

$ find ./ -name QQQ
$ find ./ -iname QQQ  # ignore case

$ find ./ -regex “.*\(YYY\|ZZZ\).*"
$ find ./ -iregex “.*\(YYY\|ZZZ\).*”   # ignore case

$ ... | awk ‘{print $1}’ | ...

$ … | sed -n 3p | ...
$ $(!!)

$ !abc

$ grep -E “.*/src/.*(java|aidl)"

$ grep -i | grep -v
$ git log —online | grep -v Merge

# Bonus:
diff / vimdiff

# Copy and delete specify lines including keyword
$ cat test.txt | grep -v Log >> test2.txt