- trd 以从字符串中删除字符串的精确字符串
原标题：tr -d to remove an exact string of characters from a string
I am trying to make tr -d remove a string of characters from an existing string, without it removing characters everywhere else.
For example, I want tr to remove : OK from the end of every string in foo.txt.
Contents of foo.txt:
BROKEN BONES: OK
Kefen Odvora: OK
BOOKS_FOR_MUM: OK
E: OK Amded: OK
This is the command I run:
cat foo.txt | tr -d ": OK$"
I want it to output this:
BROKEN BONES
Kefen Odvora
BOOKS_FOR_MUM
E: OK Amded
But instead I get this, which I don t want:
BRENBNES
efendvora
BS_FR_MUM
EAmded
How can I fix this?
最佳回答
You are using the wrong tool. You want sed, not tr:
cat foo.txt | sed s/: OK$//
or preferably
sed s/: OK$// foo.txt
when your input really is just a file, not a more complicated command.
tr -d removes all occurrences of any character found in the argument to -d; it does not treat it as a regular expression to match and remove. Specifically, you are removing all occurrences of :, , O, K, and $ from each line.
问题回答
awk to help here.
awk {sub(/: OK$/,"")} 1 Input_file
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