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GNU/Linux Basic Guide
This 255-page guide will provide you with the keys to understand the philosophy of free software, teach you how to use and handle it, and give you the tools required to move easily in the world of GNU/Linux. Many users and administrators will be taking their first steps with this GNU/Linux Basic guide and it will show you how to approach and solve the problems you encounter.
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By beg84all at 2005-01-22 14:08
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* Search and list all files from current directory and down for the string ABC:
find ./ -name "*" -exec grep -H ABC {} \;
find ./ -type f -print | xargs grep -H "ABC" /dev/null
egrep -r ABC *
* Find all files of a given type from current directory on down:
find ./ -name "*.conf" -print
* Find all user files larger than 5Mb:
find /home -size +5000000c -print
* Find all files owned by a user (defined by user id number. see /etc/passwd) on the system: (could take a very long time)
find / -user 501 -print
* Find all files created or updated in the last five minutes: (Great for finding effects of make install)
find / -cmin -5
* Find all users in group 20 and change them to group 102: (execute as root)
find / -group 20 -exec chown :102 {} \;
* Find all suid and setgid executables:
find / \( -perm -4000 -o -perm -2000 \) -type f -exec ls -ldb {} \;
find / -type f -perm +6000 -ls
Note: suid executable binaries are programs which switch to root privaleges to perform their tasks. These are created by applying a "stickey" bit: chmod +s. These programs should be watched as they are often the first point of entry for hackers. Thus it is prudent to run this command and remove the "stickey" bits from executables which either won't be used or are not required by users. chmod -s filename
* Find all world writable directories:
find / -perm -0002 -type d -print
* Find all world writable files:
find / -perm -0002 -type f -print
find / -perm -2 ! -type l -ls
* Find files with no user:
find / -nouser -o -nogroup -print
* Find files modified in the last two days:
find / -mtime 2 -o -ctime 2
* Compare two drives to see if all files are identical:
find / -path /proc -prune -o -path /new-disk -prune -o -xtype f -exec cmp {} /new-disk{} \;
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