Squeeze multiple blank lines to one

March 10th, 2007 toydi

Documents like RFCs may contain many blank-line blocks. To save the trees, i always squeeze multiple blank lines down to single blank line, before printing. Once I did this manually (yes, it’s like hell), but now I use cat -s: cat -s rfc2324.txt | tr -d ‘\\f’ | lpr I use tr -d to remove […]

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changing upper/lower case with tr

August 4th, 2006 mysurface

tr is actually a common translator, here I show you how to convert string from uppercase to lowercase echo “UPPER” | tr [A-Z] [a-z] from lower to upper echo “lower” | tr [a-z] [A-Z] ［中文翻译］ Related Postsmakes application hang less, changing the nice valueYou can run a program with different nice, by default is 0 […]

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