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Unix Tips & Tricks

This section is all about Unix Tips & Tricks.

Most unix flavors contain a lot of utilities that can be used in various ways. Here I will keep my own "things" I use daily or only once just to remember it for a later use.

Compare time on two files in (T)CSH

Compare time on two files in (T)CSH

I really don't like BASH or SH so I try to find ways not to use it.

This is what I came up to for use instead of [< file > -lt < file2 >] compare

if ( (-M < file1 >) >= (-M < file2 > ) )

Read more: Compare time on two files in (T)CSH

Find and Replace in many files

Find and Replace in many files

This is to describe how you can find and replace a text in many many files at once. It might take some time .. but it will do the job.

The FIND and SED way

find . -type f -exec sed -i 's/OLDSTRING/NEWSTRING/g' {} \;

Example

find . -type f -exec sed -i 's/\/usr\/local\/home/\/usr\/local\/new\/home/g' {} \;
find . -type f -exec sed -i 's/Beelzebub/God/g' {} \;

Observe that paths or text with a / in them need the / to be escaped(\) for sed to accept it as a / and not end of statement.

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