Using awk on mac os x

Split a log file into multiple files using a column as name with AWK: Use substr removes last character in AWK to manipulate a string per line: Perform a regular expression on last character of entire file using SED: Add some text to beginning and end of a file with AWK: Count and print how many unique fields are in all rows using AWK: Make everything lowercase with AWK: Multiple SED regular expressions: Regex with SED on multiple files: The last one would not apply to the sample log files but all files in a directory.

I included it to show how you can do a for-loop in a one-liner.

Grep, Awk, and Sed in bash on OSX | TechSlides

If you are looking for more sed and awk one-liners, check out these. Each line is matched against the pattern portion of every pattern-action statement; the associated action is performed for each matched pattern. An input line is normally made up of fields separated by white space, or by regular expression FS. If FS is null, the input line is split into one field per character. To compensate for inadequate implementation of storage management, the -mr option can be used to set the maximum size of the input record, and the -mf option to set the maximum number of fields.

Grep, Awk, and Sed in bash on OSX

Pattern-action statements are separated by newlines or semicolons. An action is a sequence of statements. A statement can be one of the following:. Statements are terminated by semicolons, newlines or right braces. String constants are quoted " ", with the usual C escapes recognized within.

Get Hardware UUID in Mac OS X

The operators! Variables can be scalars, array elements denoted x[i] or fields.

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Variables are initialized to the null string. Array subscripts can be any string, not necessarily numeric; this allows for a form of associative memory.

What Is AWK?

Multiple subscripts such as [i,j,k] are permitted; the constituents are concatenated, separated by the value of SUBSEP. The printf statement formats its expression list according to the format see printf.

The built-in function close expr closes the file or pipe expr. The built-in function fflush expr flushes any buffered output for the file or pipe expr.