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</tr>
<tr valign="top">
<td>ENVIRON</td>
<td valign="bottom">An array containing the values of the current environment. The array is indexed by the environment variables,each element being the value of that variable (e.g.,?ENVIRON["HOME"]?might be?/home/arnold). Changing this array does not affect the environment seen by programs which?gawk?spawns via redirection or the?system()?function.</td>
</tr>
<tr valign="top">
<td>ERRNO</td>
<td valign="bottom">If a system error occurs either doing a redirection for?getline,during a read for?getline,or during a?close(),then?ERRNO?will contain a string describing the error. The value is subject to translation in non-English locales.</td>
</tr>
<tr valign="top">
<td>FIELDWIDTHS</td>
<td valign="bottom">A white-space separated list of fieldwidths. When set,?gawkparses the input into fields of fixed width,instead of using the value of the?FS?variable as the field separator.</td>
</tr>
<tr valign="top">
<td>FILENAME</td>
<td valign="bottom">The name of the current input file. If no files are specified on the command line,the value of?FILENAME?is ‘‘-’’. However,FILENAME?is undefined inside the?BEGIN?block (unless set bygetline).</td>
</tr>
<tr valign="top">
<td>FNR</td>
<td valign="bottom">The input record number in the current input file.</td>
</tr>
<tr valign="top">
<td>FS</td>
<td valign="bottom">The input field separator,a space by default. See?<a href="http://www.tutorialspoint.com/#8">Fields,above.</td>
</tr>
<tr valign="top">
<td>IGNORECASE</td>
<td valign="bottom">Controls the case-sensitivity of all regular expression and string operations. If?IGNORECASE?has a non-zero value,then string comparisons and pattern matching in rules,field splitting withFS,record separating with?RS,regular expression matching with?~?and?!~,and the?gensub(),?gsub(),?index(),?match(),split(),and?sub()?built-in functions all ignore case when doing regular expression operations.?NOTE:?Array subscripting is?notaffected. However,the?asort()?and?asorti()?functions are affected.
Thus,if?IGNORECASE?is not equal to zero,?/aB/?matches all of the strings?"ab",?"aB",?"Ab",and?"AB". As with all?AWKvariables,the initial value of?IGNORECASE?is zero,so all regular expression and string operations are normally case-sensitive. Under Unix,the full ISO 8859-1 Latin-1 character set is used when ignoring case. As of?gawk?3.1.4,the case equivalencies are fully locale-aware,based on the C??facilities such as?isalpha(),and?tolupper().
</td>
</tr>
<tr valign="top">
<td>LINT</td>
<td valign="bottom">Provides dynamic control of the?--lint?option from within an?AWKprogram. When true,?gawk?prints lint warnings. When false,it does not. When assigned the string value?"fatal",lint warnings become fatal errors,exactly like?--lint=fatal. Any other true value just prints warnings.</td>
</tr>
<tr valign="top">
<td>NF</td>
<td valign="bottom">The number of fields in the current input record.</td>
</tr>
<tr valign="top">
<td>NR</td>
<td valign="bottom">The total number of input records seen so far.</td>
</tr>
<tr valign="top">
<td>OFMT</td>
<td valign="bottom">The output format for numbers,by default.</td>
</tr>
<tr valign="top">
<td>OFS</td>
<td valign="bottom">The output field separator,a space by default.</td>
</tr>
<tr valign="top">
<td>ORS</td>
<td valign="bottom">The output record separator,by default a newline.</td>
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