notebook.community

Edit and run 





In [2]:



    


time echo {1..5} | xargs -n 1 -P 5 sleep



    


















    






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In [6]:



    


xargs --help



    


















    






Usage: xargs [OPTION]... COMMAND [INITIAL-ARGS]...
Run COMMAND with arguments INITIAL-ARGS and more arguments read from input.

Mandatory and optional arguments to long options are also
mandatory or optional for the corresponding short option.
  -0, --null                   items are separated by a null, not whitespace;
                                 disables quote and backslash processing and
                                 logical EOF processing
  -a, --arg-file=FILE          read arguments from FILE, not standard input
  -d, --delimiter=CHARACTER    items in input stream are separated by CHARACTER,
                                 not by whitespace; disables quote and backslash
                                 processing and logical EOF processing
  -E END                       set logical EOF string; if END occurs as a line
                                 of input, the rest of the input is ignored
                                 (ignored if -0 or -d was specified)
  -e, --eof[=END]              equivalent to -E END if END is specified;
                                 otherwise, there is no end-of-file string
  -I R                         same as --replace=R
  -i, --replace[=R]            replace R in INITIAL-ARGS with names read
                                 from standard input; if R is unspecified,
                                 assume {}
  -L, --max-lines=MAX-LINES    use at most MAX-LINES non-blank input lines per
                                 command line
  -l[MAX-LINES]                similar to -L but defaults to at most one non-
                                 blank input line if MAX-LINES is not specified
  -n, --max-args=MAX-ARGS      use at most MAX-ARGS arguments per command line
  -P, --max-procs=MAX-PROCS    run at most MAX-PROCS processes at a time
  -p, --interactive            prompt before running commands
      --process-slot-var=VAR   set environment variable VAR in child processes
  -r, --no-run-if-empty        if there are no arguments, then do not run COMMAND;
                                 if this option is not given, COMMAND will be
                                 run at least once
  -s, --max-chars=MAX-CHARS    limit length of command line to MAX-CHARS
      --show-limits            show limits on command-line length
  -t, --verbose                print commands before executing them
  -x, --exit                   exit if the size (see -s) is exceeded
      --help                   display this help and exit
      --version                output version information and exit

Report bugs to <bug-findutils@gnu.org>.

















In [10]:



    


time echo {1..5} | xargs -n 1 -P 5 echo
#-n 1 每次只读入一个参数
# -P 5 分配5个CPU



    


















    






1
2
3
4
5

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In [30]:



    


time seq 77 80 | parallel wget http://www.gutenberg.org/cache/epub/{}/pg{}.txt
#并行下载文件
#其中{}是占位符，用来占位传入参数的位置。



    


















    






Academic tradition requires you to cite works you base your article on.
When using programs that use GNU Parallel to process data for publication
please cite:

  O. Tange (2011): GNU Parallel - The Command-Line Power Tool,
  ;login: The USENIX Magazine, February 2011:42-47.

This helps funding further development; and it won't cost you a cent.
If you pay 10000 EUR you should feel free to use GNU Parallel without citing.

To silence the citation notice: run 'parallel --bibtex'.

--2017-01-20 20:27:26--  http://www.gutenberg.org/cache/epub/79/pg79.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:27:27--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9527 (9.3K) [text/html]
Saving to: 'pg79.txt.3'

     0K .........                                             100% 3.18M=0.003s

2017-01-20 20:27:28 (3.18 MB/s) - 'pg79.txt.3' saved [9527/9527]

--2017-01-20 20:27:26--  http://www.gutenberg.org/cache/epub/77/pg77.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:27:27--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9527 (9.3K) [text/html]
Saving to: 'pg77.txt.3'

     0K .........                                             100% 2.14M=0.004s

2017-01-20 20:27:28 (2.14 MB/s) - 'pg77.txt.3' saved [9527/9527]

--2017-01-20 20:27:26--  http://www.gutenberg.org/cache/epub/78/pg78.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:27:27--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9527 (9.3K) [text/html]
Saving to: 'pg78.txt.3'

     0K .........                                             100% 1.20M=0.008s

2017-01-20 20:27:28 (1.20 MB/s) - 'pg78.txt.3' saved [9527/9527]

--2017-01-20 20:27:26--  http://www.gutenberg.org/cache/epub/80/pg80.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:27:27--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9527 (9.3K) [text/html]
Saving to: 'pg80.txt.3'

     0K .........                                             100% 23.8K=0.4s

2017-01-20 20:27:28 (23.8 KB/s) - 'pg80.txt.3' saved [9527/9527]


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In [29]:



    


time seq 77 80 | awk '{print "http://www.gutenberg.org/cache/epub/"$1"/pg"$1".txt"}' | parallel wget



    


















    






Academic tradition requires you to cite works you base your article on.
When using programs that use GNU Parallel to process data for publication
please cite:

  O. Tange (2011): GNU Parallel - The Command-Line Power Tool,
  ;login: The USENIX Magazine, February 2011:42-47.

This helps funding further development; and it won't cost you a cent.
If you pay 10000 EUR you should feel free to use GNU Parallel without citing.

To silence the citation notice: run 'parallel --bibtex'.

--2017-01-20 20:26:53--  http://www.gutenberg.org/cache/epub/80/pg80.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:26:54--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9534 (9.3K) [text/html]
Saving to: 'pg80.txt.2'

     0K .........                                             100% 1.44M=0.006s

2017-01-20 20:26:55 (1.44 MB/s) - 'pg80.txt.2' saved [9534/9534]

--2017-01-20 20:26:53--  http://www.gutenberg.org/cache/epub/78/pg78.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:26:54--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9527 (9.3K) [text/html]
Saving to: 'pg78.txt.2'

     0K .........                                             100% 1.13M=0.008s

2017-01-20 20:26:55 (1.13 MB/s) - 'pg78.txt.2' saved [9527/9527]

--2017-01-20 20:26:53--  http://www.gutenberg.org/cache/epub/79/pg79.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 307 Temporary Redirect
Location: http://www.gutenberg.org/w/captcha/question/ [following]
--2017-01-20 20:26:54--  http://www.gutenberg.org/w/captcha/question/
Reusing existing connection to www.gutenberg.org:80.
HTTP request sent, awaiting response... 200 OK
Length: 9527 (9.3K) [text/html]
Saving to: 'pg79.txt.2'

     0K .........                                             100%  849K=0.01s

2017-01-20 20:26:55 (849 KB/s) - 'pg79.txt.2' saved [9527/9527]

--2017-01-20 20:26:53--  http://www.gutenberg.org/cache/epub/77/pg77.txt
Resolving www.gutenberg.org... 152.19.134.47, 2610:28:3090:3000:0:bad:cafe:47
Connecting to www.gutenberg.org|152.19.134.47|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: 646211 (631K) [text/plain]
Saving to: 'pg77.txt.2'

     0K .......... .......... .......... .......... ..........  7% 28.8K 20s
    50K .......... .......... .......... .......... .......... 15% 44.3K 15s
   100K .......... .......... .......... .......... .......... 23% 51.0K 12s
   150K .......... .......... .......... .......... .......... 31% 39.2K 11s
   200K .......... .......... .......... .......... .......... 39% 81.3K 9s
   250K .......... .......... .......... .......... .......... 47% 81.5K 7s
   300K .......... .......... .......... .......... .......... 55%  158K 5s
   350K .......... .......... .......... .......... .......... 63%  162K 4s
   400K .......... .......... .......... .......... .......... 71%  161K 3s
   450K .......... .......... .......... .......... .......... 79% 78.1K 2s
   500K .......... .......... .......... .......... .......... 87%  152K 1s
   550K .......... .......... .......... .......... .......... 95% 91.6K 0s
   600K .......... .......... .......... .                    100% 1.77M=8.8s

2017-01-20 20:27:03 (71.6 KB/s) - 'pg77.txt.2' saved [646211/646211]


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In [31]:



    


time for x in `cat download_link.txt`; do echo $x; done



    


















    






http://www.gutenberg.org/cache/epub/1/pg1.txt
http://www.gutenberg.org/cache/epub/2/pg2.txt
http://www.gutenberg.org/cache/epub/3/pg3.txt
http://www.gutenberg.org/cache/epub/4/pg4.txt
http://www.gutenberg.org/cache/epub/5/pg5.txt
http://www.gutenberg.org/cache/epub/6/pg6.txt
http://www.gutenberg.org/cache/epub/7/pg7.txt
http://www.gutenberg.org/cache/epub/8/pg8.txt
http://www.gutenberg.org/cache/epub/9/pg9.txt
http://www.gutenberg.org/cache/epub/10/pg10.txt
http://www.gutenberg.org/cache/epub/11/pg11.txt
http://www.gutenberg.org/cache/epub/12/pg12.txt
http://www.gutenberg.org/cache/epub/13/pg13.txt
http://www.gutenberg.org/cache/epub/14/pg14.txt
http://www.gutenberg.org/cache/epub/15/pg15.txt
http://www.gutenberg.org/cache/epub/16/pg16.txt
http://www.gutenberg.org/cache/epub/17/pg17.txt
http://www.gutenberg.org/cache/epub/18/pg18.txt
http://www.gutenberg.org/cache/epub/19/pg19.txt
http://www.gutenberg.org/cache/epub/20/pg20.txt
http://www.gutenberg.org/cache/epub/21/pg21.txt
http://www.gutenberg.org/cache/epub/22/pg22.txt
http://www.gutenberg.org/cache/epub/23/pg23.txt
http://www.gutenberg.org/cache/epub/24/pg24.txt
http://www.gutenberg.org/cache/epub/25/pg25.txt
http://www.gutenberg.org/cache/epub/26/pg26.txt
http://www.gutenberg.org/cache/epub/27/pg27.txt
http://www.gutenberg.org/cache/epub/28/pg28.txt
http://www.gutenberg.org/cache/epub/29/pg29.txt
http://www.gutenberg.org/cache/epub/30/pg30.txt
http://www.gutenberg.org/cache/epub/31/pg31.txt
http://www.gutenberg.org/cache/epub/32/pg32.txt
http://www.gutenberg.org/cache/epub/33/pg33.txt
http://www.gutenberg.org/cache/epub/34/pg34.txt
http://www.gutenberg.org/cache/epub/35/pg35.txt
http://www.gutenberg.org/cache/epub/36/pg36.txt
http://www.gutenberg.org/cache/epub/37/pg37.txt
http://www.gutenberg.org/cache/epub/38/pg38.txt
http://www.gutenberg.org/cache/epub/39/pg39.txt
http://www.gutenberg.org/cache/epub/40/pg40.txt
http://www.gutenberg.org/cache/epub/41/pg41.txt
http://www.gutenberg.org/cache/epub/42/pg42.txt
http://www.gutenberg.org/cache/epub/43/pg43.txt
http://www.gutenberg.org/cache/epub/44/pg44.txt
http://www.gutenberg.org/cache/epub/45/pg45.txt
http://www.gutenberg.org/cache/epub/46/pg46.txt
http://www.gutenberg.org/cache/epub/47/pg47.txt
http://www.gutenberg.org/cache/epub/48/pg48.txt
http://www.gutenberg.org/cache/epub/49/pg49.txt
http://www.gutenberg.org/cache/epub/50/pg50.txt
http://www.gutenberg.org/cache/epub/51/pg51.txt
http://www.gutenberg.org/cache/epub/52/pg52.txt
http://www.gutenberg.org/cache/epub/53/pg53.txt
http://www.gutenberg.org/cache/epub/54/pg54.txt
http://www.gutenberg.org/cache/epub/55/pg55.txt
http://www.gutenberg.org/cache/epub/56/pg56.txt
http://www.gutenberg.org/cache/epub/57/pg57.txt
http://www.gutenberg.org/cache/epub/58/pg58.txt
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http://www.gutenberg.org/cache/epub/60/pg60.txt
http://www.gutenberg.org/cache/epub/61/pg61.txt
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http://www.gutenberg.org/cache/epub/63/pg63.txt
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http://www.gutenberg.org/cache/epub/70/pg70.txt
http://www.gutenberg.org/cache/epub/71/pg71.txt
http://www.gutenberg.org/cache/epub/72/pg72.txt
http://www.gutenberg.org/cache/epub/73/pg73.txt
http://www.gutenberg.org/cache/epub/74/pg74.txt
http://www.gutenberg.org/cache/epub/75/pg75.txt
http://www.gutenberg.org/cache/epub/76/pg76.txt
http://www.gutenberg.org/cache/epub/77/pg77.txt
http://www.gutenberg.org/cache/epub/78/pg78.txt
http://www.gutenberg.org/cache/epub/79/pg79.txt
http://www.gutenberg.org/cache/epub/80/pg80.txt
http://www.gutenberg.org/cache/epub/81/pg81.txt
http://www.gutenberg.org/cache/epub/82/pg82.txt
http://www.gutenberg.org/cache/epub/83/pg83.txt
http://www.gutenberg.org/cache/epub/84/pg84.txt
http://www.gutenberg.org/cache/epub/85/pg85.txt
http://www.gutenberg.org/cache/epub/86/pg86.txt
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http://www.gutenberg.org/cache/epub/91/pg91.txt
http://www.gutenberg.org/cache/epub/92/pg92.txt
http://www.gutenberg.org/cache/epub/93/pg93.txt
http://www.gutenberg.org/cache/epub/94/pg94.txt
http://www.gutenberg.org/cache/epub/95/pg95.txt
http://www.gutenberg.org/cache/epub/96/pg96.txt
http://www.gutenberg.org/cache/epub/97/pg97.txt
http://www.gutenberg.org/cache/epub/98/pg98.txt
http://www.gutenberg.org/cache/epub/99/pg99.txt
http://www.gutenberg.org/cache/epub/100/pg100.txt

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In [33]:



    


time cat download_link.txt | parallel echo {}



    


















    






Academic tradition requires you to cite works you base your article on.
When using programs that use GNU Parallel to process data for publication
please cite:

  O. Tange (2011): GNU Parallel - The Command-Line Power Tool,
  ;login: The USENIX Magazine, February 2011:42-47.

This helps funding further development; and it won't cost you a cent.
If you pay 10000 EUR you should feel free to use GNU Parallel without citing.

To silence the citation notice: run 'parallel --bibtex'.

http://www.gutenberg.org/cache/epub/1/pg1.txt
http://www.gutenberg.org/cache/epub/2/pg2.txt
http://www.gutenberg.org/cache/epub/3/pg3.txt
http://www.gutenberg.org/cache/epub/4/pg4.txt
http://www.gutenberg.org/cache/epub/5/pg5.txt
http://www.gutenberg.org/cache/epub/6/pg6.txt
http://www.gutenberg.org/cache/epub/7/pg7.txt
http://www.gutenberg.org/cache/epub/8/pg8.txt
http://www.gutenberg.org/cache/epub/9/pg9.txt
http://www.gutenberg.org/cache/epub/10/pg10.txt
http://www.gutenberg.org/cache/epub/11/pg11.txt
http://www.gutenberg.org/cache/epub/12/pg12.txt
http://www.gutenberg.org/cache/epub/13/pg13.txt
http://www.gutenberg.org/cache/epub/14/pg14.txt
http://www.gutenberg.org/cache/epub/15/pg15.txt
http://www.gutenberg.org/cache/epub/16/pg16.txt
http://www.gutenberg.org/cache/epub/17/pg17.txt
http://www.gutenberg.org/cache/epub/18/pg18.txt
http://www.gutenberg.org/cache/epub/19/pg19.txt
http://www.gutenberg.org/cache/epub/20/pg20.txt
http://www.gutenberg.org/cache/epub/21/pg21.txt
http://www.gutenberg.org/cache/epub/22/pg22.txt
http://www.gutenberg.org/cache/epub/23/pg23.txt
http://www.gutenberg.org/cache/epub/24/pg24.txt
http://www.gutenberg.org/cache/epub/25/pg25.txt
http://www.gutenberg.org/cache/epub/26/pg26.txt
http://www.gutenberg.org/cache/epub/27/pg27.txt
http://www.gutenberg.org/cache/epub/28/pg28.txt
http://www.gutenberg.org/cache/epub/29/pg29.txt
http://www.gutenberg.org/cache/epub/30/pg30.txt
http://www.gutenberg.org/cache/epub/31/pg31.txt
http://www.gutenberg.org/cache/epub/32/pg32.txt
http://www.gutenberg.org/cache/epub/33/pg33.txt
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