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Full Discussion: Multi html download.
Top Forums Shell Programming and Scripting Multi html download. Post 302738157 by Corona688 on Friday 30th of November 2012 12:37:18 PM
Old 11-30-2012
Since they're in the background, they have to be saved to independent files. It'd be almost impossible to guarantee the order of the output if they weren't.

I'd try splitting the file into many chunks for wget -i to handle independently. This will allow them to be concurrent without such an overwhelming number of files.

Code:
#!/bin/sh

# Calculate how many lines among n processes, 10 default
MAXPROC=${2:-10}
# Count lines first
LINES=$(wc -l < $1 )
# Divide lines by processes
let LINES=LINES/MAXPROC

# Split file into 10 chunks xaa, xab, ...
split -l $LINES < $1

# Loop over xaa, xab, ...
for FILE in x*
do
        # Download one set of files from $FILE into $FILE.out in background
        wget -nv -i "$FILE" -O - > $FILE.out 2> $FILE.err &
done

wait    # Wait for all processes to finish

# Assemble files in order
cat x*.out
cat x*.err >&2
# Remove temporary files
rm x*

Use it like
Code:
./multiget.sh filelist 5 2> errlog > output

for 5 simultaneous downloads.
 

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LEARN ABOUT CENTOS

grub2-fstest

GRUB-FSTEST(3)						     Library Functions Manual						    GRUB-FSTEST(3)

NAME

       grub-fstest -- Debug tool for GRUB's filesystem driver.

SYNOPSIS

       grub-fstest [-c | --diskcount=NUM] [-C | --crypto]
		    [-d | --debug=STRING] [-K | --zfs-key=FILE|prompt]
		    [-n | --length=NUM] [-r | --root=DEVICE_NAME]
		    [-s | --skip=NUM] [-u | --uncompress] [-v | --verbose]
		    IMAGE_PATH <blocklist FILE | cat FILE |
		    cmp FILE LOCAL | cp FILE LOCAL | crc FILE |
		    hex FILE | ls PATH | xnu_uuid DEVICE>

DESCRIPTION

       grub-fstest is a tool for testing GRUB's filesystem drivers.  You should not normally need to run this program.

OPTIONS

       --diskcount=NUM
	      Specify the number of input files.

       --crypto
	      Mount cryptographic devices.

       --debug=STRING
	      Set debug environment variable.

       --zfs-key=FILE|prompt
	      Load ZFS cryptographic key.

       --length=NUM
	      Handle NUM bytes in output file.

       --root=DEVICE_NAME
	      Set root device.

       --skip=NUM
	      Skip NUM bytes from output file.

       --uncompress
	      Uncompress data.

       --verbose
	      Print verbose messages.

COMMANDS

       blocklist FILE
	      Display block list of FILE.

       cat FILE
	      Display FILE on standard output.

       cmp FILE LOCAL
	      Compare FILE with local file LOCAL.

       cp FILE LOCAL
	      Copy FILE to local file LOCAL.

       crc FILE
	      Display the CRC-32 checksum of FILE.

       hex FILE
	      Display contents of FILE in hexidecimal.

       ls PATH
	      List files at PATH.

       xnu_uuid DEVICE
	      Display the XNU UUID of DEVICE.

SEE ALSO

       info grub

								  Wed Feb 26 2014						    GRUB-FSTEST(3)
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