09-03-2009
jlliagre and reborg. Quoting {} as "{}" or '{}' seems to be outside your experience. I personally have not hit weird quirks with modern Solaris or modern HP-UX though I view every command implementation in AIX as an adventure.
I didn't expect the o/p to be using Ubuntu Linux, but anomolous behaviour of "find ... -exec" is well documented as is anomolous behaviour of "find" in general. Whether the issue is in shell or "find" itself is academic.
I have hands-on experience of many unix variants which were volume sellers but far from perfect.
Don't forget that we are concerned about what happens when you don't use quotes. I have never seen an issue after using quotes (though I have read of such issues).
It's a bit like using $LINENO or $EXIT in modern scripts. You might get away with it and you might not.
Forgot to answer one of your earlier questions. In one event a supplied script to clean /tmp of old temporary files from a well-known dirty commercial application contained "find /tmp/ ... -exec rm {} \;". It worked for a while. The filenames of the temporary files contained a middle string which was entered by the user. The cleanup script eventually failed with a syntax error on encountering a filename containing space characters. The fix was to quote {} as "{}" .
I suppose the big question is whether the character displayed as a space character on an old dumb terminal was actually a space character? We shall never know.
Last edited by methyl; 09-03-2009 at 02:34 AM..
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crontab
crontab(5) File Formats Manual crontab(5)
Name
crontab - clock daemon table file
Syntax
/usr/lib/crontab
Description
The command executes at specified dates and times according to the instructions in the file. The file consists of lines with six fields
each. The format for a line is as follows:
minute hour day month weekday command
The following list defines each field in the line:
minute (0-59) The exact minute that the command sequence executes.
hour (0-23) The hour of the day that the command sequence executes.
day (1-31) The day of the month that the command sequence executes.
month (1-12) The month of the year that the command sequence executes.
weekday (1-7) The day of the week that the command sequence executes. Monday = 1, Tuesday = 2, and so forth.
command The complete command sequence variable that is to be executed. Note that the command string must conform to Bourne shell
syntax.
The first five integer fields may be specified as follows:
o A single number in the specified range
o Two numbers separated by a minus, meaning a range inclusive
o A list of numbers separated by commas, meaning any of the numbers
o An asterisk meaning all legal values
The sixth field is a string that is executed by the shell at the specified times. A percent sign (%) in this field is translated to a new-
line character. Only the first line of the command field, up to a percent sign (%) or end of line, is executed by the shell. The other
lines are made available to the command as standard input.
Examples
The following example is part of a file:
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