3,113 reputation
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location United States
age 53
visits member for 5 years, 3 months
seen Oct 1 at 23:34
Long-time Informix user and developer, experienced in C and Unix (many variants). Email: jonathan.leffler@gmail.com

Mar
29
comment stdout and stderr of script doesn't get redirected when executed by cron
@Chris: yes - my statement is too sweeping and your analysis is correct. Thanks.
Mar
28
answered stdout and stderr of script doesn't get redirected when executed by cron
Mar
25
comment su using here document
Note that the su command would not execute the second who - even if you managed to get past the password issue. It would either process the command given on its command line ('-c "command arg1 arg2"') or it would go interactive. Commands asking for a password usually read from your tty rather than from standard input - which means you have to fake it out (probably with 'expect' and a pseudo-tty).
Mar
23
comment Linux Kernel Messages: ata1.00: status: { DRDY ERR }
Your drive is already close to dead. I hope you have good backups, because it is a bit late now to do much about it.
Mar
22
comment How do you manage the user groups that users are assoicated to in Mac OS X?
That (dscl) is harder to use than the System Preferences, but it gives you greater control which is sometimes necessary.
Mar
20
revised Essential topics to be discussed in Linux 101
Reorganize a bit
Mar
20
answered Essential topics to be discussed in Linux 101
Mar
17
answered OS X: Base64 encode via command line
Mar
17
comment transfer time of a cylinder
@~quack: that was my impression. You did the homework tagging (thanks); I just hooked them all together. Collectively, the answers should provide a reasonable treatise on disk technology. Plus this article is interesting - why XP may not like the next generation hard disks so much: arstechnica.com/microsoft/news/2010/03/…
Mar
16
comment sectors and clusters
And superuser.com/questions/120461/transfer-time-of-a-cylinder
Mar
16
comment How do I calculate the bytes per track based on the transfer rate?
And superuser.com/questions/120461/transfer-time-of-a-cylinder
Mar
16
comment rotational latency
And superuser.com/questions/120461/transfer-time-of-a-cylinder
Mar
16
comment number of tracks
And superuser.com/questions/120461/transfer-time-of-a-cylinder
Mar
16
comment hard drive sectors vs. tracks
And superuser.com/questions/120461/transfer-time-of-a-cylinder
Mar
16
comment transfer time for a file
And superuser.com/questions/120461/transfer-time-of-a-cylinder
Mar
16
comment transfer time of a cylinder
See also this other set of 6 closely related questions: superuser.com/questions/119446/sectors-and-clusters superuser.com/questions/119051/transfer-time-for-a-file superuser.com/questions/107723/hard-drive-sectors-vs-tracks superuser.com/questions/119048/number-of-tracks superuser.com/questions/119026/rotational-latency superuser.com/questions/119030/bytes-per-track
Mar
16
comment sectors and clusters
See this set of 6 closely related questions: superuser.com/questions/119446/sectors-and-clusters superuser.com/questions/119051/transfer-time-for-a-file superuser.com/questions/107723/hard-drive-sectors-vs-tracks superuser.com/questions/119048/number-of-tracks superuser.com/questions/119026/rotational-latency superuser.com/questions/119030/bytes-per-track
Mar
16
comment transfer time for a file
See this set of 6 closely related questions: superuser.com/questions/119446/sectors-and-clusters superuser.com/questions/119051/transfer-time-for-a-file superuser.com/questions/107723/hard-drive-sectors-vs-tracks superuser.com/questions/119048/number-of-tracks superuser.com/questions/119026/rotational-latency superuser.com/questions/119030/bytes-per-track
Mar
16
comment hard drive sectors vs. tracks
See this set of 6 closely related questions: superuser.com/questions/119446/sectors-and-clusters superuser.com/questions/119051/transfer-time-for-a-file superuser.com/questions/107723/hard-drive-sectors-vs-tracks superuser.com/questions/119048/number-of-tracks superuser.com/questions/119026/rotational-latency superuser.com/questions/119030/bytes-per-track
Mar
16
comment number of tracks
See this set of 6 closely related questions: superuser.com/questions/119446/sectors-and-clusters superuser.com/questions/119051/transfer-time-for-a-file superuser.com/questions/107723/hard-drive-sectors-vs-tracks superuser.com/questions/119048/number-of-tracks superuser.com/questions/119026/rotational-latency superuser.com/questions/119030/bytes-per-track