4 Alternatives + Submit Alt
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Reads stdin, and outputs each line only once - without sorting ahead of time. This does use more memory than your system's sort utility.
4perl -ne 'print if !$a{$_}++' -
3export PATH=`echo -n $PATH | awk -v RS=":" '{ if (!x[$0]++) {printf s $0; s=":"} }'`
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Thanks to the authors of:
awk '!x[$0]++' <file>and the author of:joinargs() { (local IFS="$1"; shift && echo "$*") }and others, we can have a fast Linux or android. IMPORTANT if you find a priority order problem in PATH you can push a path directory to the front without duplication as follows:PATH=/bin:$PATHthen ... Check duplication with:echo $PATH|tr : '\n'|sort|uniq -dFinally do a very neat line by line list of $PATH:echo "${PATH//:/$'\n'}The speed up is very noticeable for android, and builds on Linux Ubantu are much faster with make and scripts. I will update the command on request. Timothy from SONY2glu() { (local IFS="$1"; shift && echo "$*") }; repath() { ( _E=`echo "${PATH//:/$'\n'}" | awk '!x[$0]++'`; glu ":" $_E ) ; } ; PATH=`repath` ; export PATH -
Remove duplicate lines whilst keeping order and empty lines
2awk '!NF || !seen[$0]++'
What do you think?
Any thoughts on this command? Does it work on your machine? Can you do the same thing with only 14 characters?
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echo -e "aaa\nbbb\naaa"|awk \!'x[$0]++'outputs aaa bbb not just "aaa"