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Full Discussion: Curl parallel download file list
Top Forums Shell Programming and Scripting Curl parallel download file list Post 302998235 by Chubler_XL on Saturday 27th of May 2017 01:44:46 PM
Old 05-27-2017
export -f is a bash feature and I use it here to insure the internal function fetch_url is exported to sub shells. This is needed as xargs is an external command to the shell and runs the assembled commands in a new shells.

I assumed, as you were using GNU xargs (-P feature is a GNU extension), that you were also using the bash shell. I've updated my original post to specify the required shell, and this is all you may need to do to get you version working.

However, if you do not wish to use bash, you could put your function in an external script so that it can be called from xargs for example:

$HOME/bin/fetch_url:
Code:
#!/bin/sh
URL=$@
filename=${URL##*=}
curl -r 0-50000 -L "$URL" -o ${filename}.html -a ${filename}.log

And from another script (or the command line) you can call this with:
Code:
xargs -n 1 -P 10 $HOME/bin/fetch_url < url.list

Last edited by Chubler_XL; 05-27-2017 at 02:54 PM..
 

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LEARN ABOUT OPENSOLARIS

getusershell

getusershell(3C)					   Standard C Library Functions 					  getusershell(3C)

NAME

       getusershell, setusershell, endusershell - get legal user shells

SYNOPSIS

       #include <unistd.h>

       char *getusershell(void);

       void setusershell(void);

       void endusershell(void);

DESCRIPTION

       The  getusershell()  function  returns  a  pointer  to  a  legal  user  shell  as defined by the system manager in the file /etc/shells. If
       /etc/shells does not exist, the following locations of the standard system shells are used in its place:

	 /bin/bash		    /bin/csh
	 /bin/jsh		    /bin/ksh
	 /bin/ksh93		    /bin/pfcsh
	 /bin/pfksh		    /bin/pfsh
	 /bin/sh		    /bin/tcsh
	 /bin/zsh		    /sbin/jsh
	 /sbin/pfsh		    /sbin/sh
	 /usr/bin/bash		    /usr/bin/csh
	 /usr/bin/jsh		    /usr/bin/ksh
	 /usr/bin/ksh93 	    /usr/bin/pfcsh
	 /usr/bin/pfksh 	    /usr/bin/pfsh
	 /usr/bin/sh		    /usr/bin/tcsh
	 /usr/bin/zsh		    /usr/sfw/bin/zsh
	 /usr/xpg4/bin/sh

       The getusershell() function opens the file /etc/shells, if it exists, and returns the next entry in the list of shells.

       The setusershell() function rewinds the file or the list.

       The endusershell() function closes the file, frees any memory used by getusershell() and setusershell(), and rewinds the file /etc/shells.

RETURN VALUES

       The getusershell() function returns a null pointer on EOF.

BUGS

       All information is contained in memory that may be freed with a call to endusershell(), so it must be copied if it is to be saved.

NOTES

       Restricted shells should not be listed in /etc/shells.

SunOS 5.11							    1 Nov 2007							  getusershell(3C)
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