Changes

{{Mark|Updated with Version 9.0:}} All functions and errors in this module are assigned to the <code><nowiki>http://basex.org/modules/proc</nowiki></code> namespace, which is statically bound to the {{Code|proc}} prefix.<br/>All errors are assigned to the <code><nowiki>http://basex.org/errors</nowiki></code> namespace, which is statically bound to the {{Code|bxerr}} prefix.

|{{Func|proc:system|$cmd as xs:string|xs:string}}<br/>{{Func|proc:system|$cmd as xs:string, $args as xs:string*|xs:string}}<br/>{{Func|proc:system|$cmd as xs:string, $args as xs:string*, $encoding options as map(xs:string, xs:string)|xs:string}}<br/>

|Executes the specified command in a separate process and returns the result as string.<br/>{{Code|$cmd}} is the name of the command. Arguments , arguments to the command may be specified via {{Code|$args}}.<br/>The result can be explicitly converted to a specified {{Code|$options}} parameter contains process options:* {{Code|encoding}}: convert result to the specified encoding. If no encoding is specifiedsupplied, the system’s default encoding is used.* {{Code|timeout}}: abort process execution after the specified number of seconds.* {{Code|dir}}: process command in the specified directory.* {{Code|input}}: standard string input ({{Code|stdin}}) to be passed on to the command.

|{{Error|BXPRnnnnencoding|#Error}} the specified encoding does not exist or is not supported.<br/>{{Error|timeout|#Error}} the specified timeout was exceeded.<br/>{{Error|error|#Error}} the command could not be executed, or an I/O exception was raised.<br/>{{Error|code....|#Error}} If the command results in commands returns an errorexit code different to 0, an XQuery error will be raised. Its code will consist of the letters {{Code|BXPRcode}} and four digits with the command’s exit code.<br/>{{Error|BXPR9999|#Error}} the specified encoding does not exist or is not supported.

* Analyses the given input and counts the number of lines, words and characters (provided that {{Code|wc}} is available on the system):<pre class="brush:xquery">proc:system( 'wc', (), map { 'input': 'A B' || out:nl() || 'C' })</pre>* The following example returns "Command “Command not found", if found” (unless {{Code|xyz}} is a valid command on the command "xyz" cannot be located or executedsystem):

} catch bxerrproc:BXPR0002 error { 'Command not found.: '|| $err:description

|{{Func|proc:execute|$cmd as xs:string|element(result)}}<br/>{{Func|proc:execute|$cmd as xs:string, $args as xs:string*|element(result)}}<br/>{{Func|proc:execute|$cmd as xs:string, $args as xs:string*, $encoding options as map(xs:string, xs:string)|element(result)}}

|Executes the specified command in a separate process and returns the result as element.<br/>:* {{Code|$cmd}} is the name of the command. Arguments , and arguments to the command may be specified via {{Code|$args}}.<br/>* The result can same {{Code|$options}} are allowed as for [[#proc:system|proc:system]].* Instead of the {{Code|proc:error}} error, the error message and process code will be explicitly converted assigned to a specified the returned elements.* Instead of the {{Code|$encodingproc:code....}}. If no encoding is specifiederror, the system’s default encoding is usederror message will be assigned to the returned element (no process code will be returned).<br/>A The result has the following structure:<br/>

<output>...result output...</output> <error>...error outputmessage...</error> <code>0...process code...</code>

|{{Error|BXPR9999encoding|#Error}} the specified encoding does not exist or is not supported.<br/>{{Error|timeout|#Error}} the specified timeout was exceeded.

|Returns the Java system property , specified by {{Code|$name}}, or a context parameter of the {{Code|web.xml}} file with that name (see [[Web_Application#Configuration|Web Applications]]). An empty sequence is returned if the property does not exist. For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-environment-variable fn:environment-variable].

|Returns the names of all Java system propertiesand context parameters of the {{Code|web.xml}} file (see [[Web_Application#Configuration|Web Applications]]). For environment variables of the operating system, please use [https://www.w3.org/TR/xpath-functions-30/#func-available-environment-variables fn:available-environment-variables].

|{{Code|BXPR9999code...}}|The result of a command call with an exit code different to 0.|-|{{Code|code9999}}|A command could not be executed.|-|{{Code|encoding}}