single quote usage in awk

single_quote_usage_in_awk.txt

single quote using in awk
###### Using Single QUote in awk script
 
     function ltrim_single_quote(s) { return sub(/^\047+/, "", s); return s}                                                                                                                                    
     function rtrim_single_quote(s) { return sub(/'\047+$/, "", s); return s}                                                                                                                                   
     function trim_single_quote(s) { return ltrim_single_quote(rtrim_single_quote(s)) } 

* [reference 1](http://www.gnu.org/software/gawk/manual/html_node/Quoting.html)


###### Using Single Quote in command line
This command will print "'demo'":
* Using variable  
`echo 'demo' | awk -v q=\' '{printf "%s%s%s\n", q, $0, q}'`
* Using hex or octal representation of the ascii character   
`echo 'demo' | awk '{printf "\x27%s\x27\n", $0}`
`echo 'demo' | awk '{printf "\047%s\047\n", $0}`

* [reference 1](http://www.techsupportforum.com/forums/f64/using-the-single-quote-character-in-an-awk-print-statement-373710.html)
* [regerence 2](http://stackoverflow.com/a/23118995/1889327)