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summer-wu 2015-10-07 11:34:01 +08:00
parent cafa2fb2fd
commit 8eda2266bc
1 changed files with 21 additions and 0 deletions
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#replace : with new line
echo $PATH|tr ":" "\n" #equivalent to:
echo $PATH|tr -t ":" \n
#complement "aa"
echo aabbccd |tr -c "aa" 1
#output: aa11111%
#tip: Complement meaning keep aa,all other is replace with 1
#complement "ab\n"
echo aabbccd |tr -c "ab\n" 1
#output: aabb111 with new line
#preserve all alpha(-c),sequeeze mode instead of character mode
echo $PATH|tr -cs "[:alpha:]" "\n"
#ordered list to unordered list
echo "1 /usr/bin\n2 /bin" |tr -cs "/\n[:alpha:]" "+"
#remove all occurance of "ab"
echo aabbcc |tr -d "ab"