What is “C sort order” in pm-action manpage? [duplicate]

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  • What does “LC_ALL=C” do?

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From manpage pm-action(8):




/etc/pm/sleep.d, /usr/lib/pm-utils/sleep.d


Programs in these directories (called hooks) are combined
and executed in C sort order before suspend and hibernate
with as argument ´suspend´ or ´hibernate´.



Afterwards they
are called in reverse order with argument ´resume´ and
´thaw´ respectively.



If both directories contain a similar
named file
, the one in /etc/pm/sleep.d will get preference.
It is possible to disable a hook in the distribution
directory by putting a non-executable file in
/etc/pm/sleep.d, or by adding it to the HOOK_BLACKLIST
configuration variable.




What is "C sort order"?



Does "a similar named file" mean two files with the same filename?



I have two files /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/20_cpu_freq.
When resume and thaw, which one is run first and which second?



Thanks.







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marked as duplicate by muru, Jeff Schaller, Wouter Verhelst, Hauke Laging, Christopher Apr 4 at 13:34


This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.


















    up vote
    1
    down vote

    favorite













    This question already has an answer here:



    • What does “LC_ALL=C” do?

      5 answers



    From manpage pm-action(8):




    /etc/pm/sleep.d, /usr/lib/pm-utils/sleep.d


    Programs in these directories (called hooks) are combined
    and executed in C sort order before suspend and hibernate
    with as argument ´suspend´ or ´hibernate´.



    Afterwards they
    are called in reverse order with argument ´resume´ and
    ´thaw´ respectively.



    If both directories contain a similar
    named file
    , the one in /etc/pm/sleep.d will get preference.
    It is possible to disable a hook in the distribution
    directory by putting a non-executable file in
    /etc/pm/sleep.d, or by adding it to the HOOK_BLACKLIST
    configuration variable.




    What is "C sort order"?



    Does "a similar named file" mean two files with the same filename?



    I have two files /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/20_cpu_freq.
    When resume and thaw, which one is run first and which second?



    Thanks.







    share|improve this question












    marked as duplicate by muru, Jeff Schaller, Wouter Verhelst, Hauke Laging, Christopher Apr 4 at 13:34


    This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.
















      up vote
      1
      down vote

      favorite









      up vote
      1
      down vote

      favorite












      This question already has an answer here:



      • What does “LC_ALL=C” do?

        5 answers



      From manpage pm-action(8):




      /etc/pm/sleep.d, /usr/lib/pm-utils/sleep.d


      Programs in these directories (called hooks) are combined
      and executed in C sort order before suspend and hibernate
      with as argument ´suspend´ or ´hibernate´.



      Afterwards they
      are called in reverse order with argument ´resume´ and
      ´thaw´ respectively.



      If both directories contain a similar
      named file
      , the one in /etc/pm/sleep.d will get preference.
      It is possible to disable a hook in the distribution
      directory by putting a non-executable file in
      /etc/pm/sleep.d, or by adding it to the HOOK_BLACKLIST
      configuration variable.




      What is "C sort order"?



      Does "a similar named file" mean two files with the same filename?



      I have two files /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/20_cpu_freq.
      When resume and thaw, which one is run first and which second?



      Thanks.







      share|improve this question













      This question already has an answer here:



      • What does “LC_ALL=C” do?

        5 answers



      From manpage pm-action(8):




      /etc/pm/sleep.d, /usr/lib/pm-utils/sleep.d


      Programs in these directories (called hooks) are combined
      and executed in C sort order before suspend and hibernate
      with as argument ´suspend´ or ´hibernate´.



      Afterwards they
      are called in reverse order with argument ´resume´ and
      ´thaw´ respectively.



      If both directories contain a similar
      named file
      , the one in /etc/pm/sleep.d will get preference.
      It is possible to disable a hook in the distribution
      directory by putting a non-executable file in
      /etc/pm/sleep.d, or by adding it to the HOOK_BLACKLIST
      configuration variable.




      What is "C sort order"?



      Does "a similar named file" mean two files with the same filename?



      I have two files /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/20_cpu_freq.
      When resume and thaw, which one is run first and which second?



      Thanks.





      This question already has an answer here:



      • What does “LC_ALL=C” do?

        5 answers









      share|improve this question











      share|improve this question




      share|improve this question










      asked Apr 2 at 22:37









      Tim

      22.6k63224401




      22.6k63224401




      marked as duplicate by muru, Jeff Schaller, Wouter Verhelst, Hauke Laging, Christopher Apr 4 at 13:34


      This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.






      marked as duplicate by muru, Jeff Schaller, Wouter Verhelst, Hauke Laging, Christopher Apr 4 at 13:34


      This question has been asked before and already has an answer. If those answers do not fully address your question, please ask a new question.






















          1 Answer
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          The C lexical sort order is very simple: characters with a lower numeric value sort before characters with a higher one. As almost all UNIX-derived systems nowadays use extended ASCII-derived character sets, the ordering would therefore be 8-bit as follows:



          • Control characters: NUL-US (^@-^_: 0-26)

          • Printable characters: (space)-/, 0-9, :-@, A-Z, [-` , a-z, {-~

          • Extended characters: stuff afterwards (depends on the codepage)

          Because of this, here are some filenames, in order:



          !afile
          0Afile
          0_file
          0afile
          0~file
          20-cpu_freq
          20_cpu_freq
          94Cpufreq
          94cpufreq


          By "similar named file", the two directory lists are combined, and if two file have the same name, the one in /etc/pm/sleep.d wins: if you had /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/94cpufreq, the latter would be read.



          The order which these will be run is dictated by the operation that pm-utils is doing (from HOWTO.hooks):




          SLEEP.D SPECIFIC NOTES



          For any given sleep/wakeup cycle, the hooks in sleep.d are run twice:



          • Once in C lexical sort order before the system goes to sleep, and

          • Once in reverse C lexical sort order when the system wakes up.



          TL;DR: 20_cpu_freq will be run first and 94cpufreq second when preparing to sleep, and the other way around when waking up.






          share|improve this answer





























            1 Answer
            1






            active

            oldest

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            1 Answer
            1






            active

            oldest

            votes









            active

            oldest

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            active

            oldest

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            up vote
            3
            down vote













            The C lexical sort order is very simple: characters with a lower numeric value sort before characters with a higher one. As almost all UNIX-derived systems nowadays use extended ASCII-derived character sets, the ordering would therefore be 8-bit as follows:



            • Control characters: NUL-US (^@-^_: 0-26)

            • Printable characters: (space)-/, 0-9, :-@, A-Z, [-` , a-z, {-~

            • Extended characters: stuff afterwards (depends on the codepage)

            Because of this, here are some filenames, in order:



            !afile
            0Afile
            0_file
            0afile
            0~file
            20-cpu_freq
            20_cpu_freq
            94Cpufreq
            94cpufreq


            By "similar named file", the two directory lists are combined, and if two file have the same name, the one in /etc/pm/sleep.d wins: if you had /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/94cpufreq, the latter would be read.



            The order which these will be run is dictated by the operation that pm-utils is doing (from HOWTO.hooks):




            SLEEP.D SPECIFIC NOTES



            For any given sleep/wakeup cycle, the hooks in sleep.d are run twice:



            • Once in C lexical sort order before the system goes to sleep, and

            • Once in reverse C lexical sort order when the system wakes up.



            TL;DR: 20_cpu_freq will be run first and 94cpufreq second when preparing to sleep, and the other way around when waking up.






            share|improve this answer


























              up vote
              3
              down vote













              The C lexical sort order is very simple: characters with a lower numeric value sort before characters with a higher one. As almost all UNIX-derived systems nowadays use extended ASCII-derived character sets, the ordering would therefore be 8-bit as follows:



              • Control characters: NUL-US (^@-^_: 0-26)

              • Printable characters: (space)-/, 0-9, :-@, A-Z, [-` , a-z, {-~

              • Extended characters: stuff afterwards (depends on the codepage)

              Because of this, here are some filenames, in order:



              !afile
              0Afile
              0_file
              0afile
              0~file
              20-cpu_freq
              20_cpu_freq
              94Cpufreq
              94cpufreq


              By "similar named file", the two directory lists are combined, and if two file have the same name, the one in /etc/pm/sleep.d wins: if you had /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/94cpufreq, the latter would be read.



              The order which these will be run is dictated by the operation that pm-utils is doing (from HOWTO.hooks):




              SLEEP.D SPECIFIC NOTES



              For any given sleep/wakeup cycle, the hooks in sleep.d are run twice:



              • Once in C lexical sort order before the system goes to sleep, and

              • Once in reverse C lexical sort order when the system wakes up.



              TL;DR: 20_cpu_freq will be run first and 94cpufreq second when preparing to sleep, and the other way around when waking up.






              share|improve this answer
























                up vote
                3
                down vote










                up vote
                3
                down vote









                The C lexical sort order is very simple: characters with a lower numeric value sort before characters with a higher one. As almost all UNIX-derived systems nowadays use extended ASCII-derived character sets, the ordering would therefore be 8-bit as follows:



                • Control characters: NUL-US (^@-^_: 0-26)

                • Printable characters: (space)-/, 0-9, :-@, A-Z, [-` , a-z, {-~

                • Extended characters: stuff afterwards (depends on the codepage)

                Because of this, here are some filenames, in order:



                !afile
                0Afile
                0_file
                0afile
                0~file
                20-cpu_freq
                20_cpu_freq
                94Cpufreq
                94cpufreq


                By "similar named file", the two directory lists are combined, and if two file have the same name, the one in /etc/pm/sleep.d wins: if you had /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/94cpufreq, the latter would be read.



                The order which these will be run is dictated by the operation that pm-utils is doing (from HOWTO.hooks):




                SLEEP.D SPECIFIC NOTES



                For any given sleep/wakeup cycle, the hooks in sleep.d are run twice:



                • Once in C lexical sort order before the system goes to sleep, and

                • Once in reverse C lexical sort order when the system wakes up.



                TL;DR: 20_cpu_freq will be run first and 94cpufreq second when preparing to sleep, and the other way around when waking up.






                share|improve this answer














                The C lexical sort order is very simple: characters with a lower numeric value sort before characters with a higher one. As almost all UNIX-derived systems nowadays use extended ASCII-derived character sets, the ordering would therefore be 8-bit as follows:



                • Control characters: NUL-US (^@-^_: 0-26)

                • Printable characters: (space)-/, 0-9, :-@, A-Z, [-` , a-z, {-~

                • Extended characters: stuff afterwards (depends on the codepage)

                Because of this, here are some filenames, in order:



                !afile
                0Afile
                0_file
                0afile
                0~file
                20-cpu_freq
                20_cpu_freq
                94Cpufreq
                94cpufreq


                By "similar named file", the two directory lists are combined, and if two file have the same name, the one in /etc/pm/sleep.d wins: if you had /usr/lib/pm-utils/sleep.d/94cpufreq and /etc/pm/sleep.d/94cpufreq, the latter would be read.



                The order which these will be run is dictated by the operation that pm-utils is doing (from HOWTO.hooks):




                SLEEP.D SPECIFIC NOTES



                For any given sleep/wakeup cycle, the hooks in sleep.d are run twice:



                • Once in C lexical sort order before the system goes to sleep, and

                • Once in reverse C lexical sort order when the system wakes up.



                TL;DR: 20_cpu_freq will be run first and 94cpufreq second when preparing to sleep, and the other way around when waking up.







                share|improve this answer














                share|improve this answer



                share|improve this answer








                edited Apr 3 at 5:35

























                answered Apr 3 at 4:20









                ErikF

                2,7011413




                2,7011413












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