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Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.1


From: Piotr Grzybowski
Subject: Re: PROMPT_COMMAND='history -a; history -n' causes shell hang in OX 10.10 Yosemite / bash 3.2.53
Date: Wed, 5 Nov 2014 23:11:03 +0100

On Wed, Nov 5, 2014 at 2:57 PM, Chet Ramey <address@hidden> wrote:
> I still can't reproduce it on OS X 10.10: [..]

 not only I cannot reproduce it at the moment, but also I have reached
the following state (user: root):

# cat .bash_history
ls -al
#1415144153
ls -al .bash_history
#1415144154
pwd
#1415144159
rm .bash_history
#1415144161
cd
#1415144163
pwd
#1415144165
rm .bash_history
#1415144171
i=0; while [ $i -lt 64 ]; do history -a; history -n; let i++; done;

# ls -alh .bash_history
-rw-------  1 root  wheel   9.0M Nov  5 22:59 .bash_history

# du -sh .bash_history
9.0M    .bash_history

# hexdump -C .bash_history
00000000  6c 73 20 2d 61 6c 20 0a  23 31 34 31 35 31 34 34  |ls -al .#1415144|
00000010  31 35 33 0a 6c 73 20 2d  61 6c 20 2e 62 61 73 68  |153.ls -al .bash|
00000020  5f 68 69 73 74 6f 72 79  20 0a 23 31 34 31 35 31  |_history .#14151|
00000030  34 34 31 35 34 0a 70 77  64 0a 23 31 34 31 35 31  |44154.pwd.#14151|
00000040  34 34 31 35 39 0a 72 6d  20 2e 62 61 73 68 5f 68  |44159.rm .bash_h|
00000050  69 73 74 6f 72 79 20 0a  23 31 34 31 35 31 34 34  |istory .#1415144|
00000060  31 36 31 0a 63 64 0a 23  31 34 31 35 31 34 34 31  |161.cd.#14151441|
00000070  36 33 0a 70 77 64 0a 23  31 34 31 35 31 34 34 31  |63.pwd.#14151441|
00000080  36 35 0a 72 6d 20 2e 62  61 73 68 5f 68 69 73 74  |65.rm .bash_hist|
00000090  6f 72 79 20 0a 23 31 34  31 35 31 34 34 31 37 31  |ory .#1415144171|
000000a0  0a 69 3d 30 3b 20 77 68  69 6c 65 20 5b 20 24 69  |.i=0; while [ $i|
000000b0  20 2d 6c 74 20 36 34 20  5d 3b 20 64 6f 20 68 69  | -lt 64 ]; do hi|
000000c0  73 74 6f 72 79 20 2d 61  3b 20 68 69 73 74 6f 72  |story -a; histor|
000000d0  79 20 2d 6e 3b 20 6c 65  74 20 69 2b 2b 3b 20 64  |y -n; let i++; d|
000000e0  6f 6e 65 3b 0a 00 00 00  00 00 00 00 00 00 00 00  |one;............|
000000f0  00 00 00 00 00 00 00 00  00 00 00 00 00 00 00 00  |................|
*
00902b60

 which puzzles me a bit.
 Now I lost even all my while-loop commands! :)
 Graham: did you actually logout and removed the history file, and
therefore started fresh? Sorry I guess I lost track of what is going
on here.

cheers,
pg



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