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Full Discussion: Linux questions
Operating Systems Linux Linux questions Post 40138 by Enigma777 on Tuesday 9th of September 2003 10:03:14 PM
Old 09-09-2003
Linux questions

Hi everyone,

I came from a diffrent UNIX background and am trying to learn Linux (Red Hat) in a hurry. I would be very grateful if you could help me with the following questions. I know the answers for questions 1, 3, and 4 in a Sun Solaris environment, but not in Linux... Thanks in advance for your help!

1. When the command "touch" is used to create a file, it assigns some default permissions to the file. What would you do to make "touch" command create files with different default permissions?


2. Using bash shell, run the following commands in a clean directory:

for ((i=20000;i--;)) ; do touch test$i ; done
for ((i=10;i--;)) ; do touch file$i ; done

This will take a while.

Now try to list all files beginning with 'test':

ls test*

This will give an error:

bash: /bin/ls: Argument list too long

How would you get around this problem (i.e., successfully list all these files)?


3. How would you automatically mount a device each time the system starts up?


4. While trying to "umount" a device, it will fail if the device is busy. How would you determine which process is causing the device to be busy?


-- Enigma777
 

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TOUCH(1)							   User Commands							  TOUCH(1)

NAME
touch - change file timestamps SYNOPSIS
touch [OPTION]... FILE... DESCRIPTION
Update the access and modification times of each FILE to the current time. Mandatory arguments to long options are mandatory for short options too. -a change only the access time -B, --backward=SECONDS Modify the time by going back SECONDS seconds. For example, touch -r foo -B 5 bar will make the file bar 5 seconds older than file foo. -c, --no-create do not create any files -d, --date=STRING parse STRING and use it instead of current time -F, --forward=SECONDS Modify the time by going forward SECONDS seconds. For example, touch -r foo -F 5 bar will make the file bar 5 seconds newer than file foo. -f (ignored) -m change only the modification time -r, --reference=FILE use this file's times instead of current time -t STAMP use [[CC]YY]MMDDhhmm[.ss] instead of current time --time=WORD set time given by WORD: access atime use (same as -a) modify mtime (same as -m) --help display this help and exit --version output version information and exit Note that the -d and -t options accept different time-date formats. AUTHOR
Written by Paul Rubin, Arnold Robbins, Jim Kingdon, David MacKenzie, and Randy Smith. REPORTING BUGS
Report bugs to <bug-coreutils@gnu.org>. COPYRIGHT
Copyright (C) 2002 Free Software Foundation, Inc. This is free software; see the source for copying conditions. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU- LAR PURPOSE. SEE ALSO
The full documentation for touch is maintained as a Texinfo manual. If the info and touch programs are properly installed at your site, the command info touch should give you access to the complete manual. touch (coreutils) 4.5.3 October 2002 TOUCH(1)
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