Match exact string using grep

Try one of:

grep -w "deiauk" textfile

grep "\<deiauk\>" textfile

Try this with GNU grep and mark word boundaries with \b:

grep "\bdeiauk\b" file

Output:

deiauk 1611516 afsdf 765

See: http://www.regular-expressions.info/wordboundaries.html

If your grep supports -P (PCRE), you can do:

$ grep -P '(^|\s)\Kdeiauk(?=\s|$)' file.txt 
deiauk 1611516 afsdf 765
deiauk 1611516 afsdf ddfgfgd

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