Unix Utilities
Local
See Commands by Name below
- Linking, Determining what libraries an object file needs, see nm
- Linked, Determining what dynamic libraries an executable or dynamic library needs,
see ldd
Commands By Name
External
od
Use od to show the raw data in a file.
// Show as unsigned ints: # od -t u1 version.txt 0000000 57 46 51 46 49 100 0000006
// Show as octal: # od version.txt 0000000 027071 027063 062061 0000006 // Show
the contents as ascii: # od -t c version.txt 0000000 9 . 3 . 1 d 0000006
top
# show cpu activity and load info: top # type control-c to exit
id
Shows uid (userid), gid (groupid), and groups
# show your id info id # show the id info of another user id username
ldd
Shows what dynamic libraries an executable or dynamic library needs.
# Solaris ldd libMyStuff.so
nm
Shows what (?)symbols(?) are in an object file. Look for UNDEF symbols to see what
it needs (good for figuring out what libraries it needs).
# nm stuff.o # to have it demangle c++ names (Solaris): nm -C stuff.o
mount
# Mounting a Solaris nfs share on a Red Hat Enterprise Linux machine # note that
you are prompted for the password this way: mount -t cifs //solarisMachineName/sharedDirName
/mnt/somedirectoryName -o username=usernameGoesHere
smbclient
I have had luck looking at Windows shares from Linux and from Solaris using smbclient.
smbclient is very much like ftp. Type help to get a list of commands.
# mount a Windows share from a workgroup machine or a windows machine on a domain:
smbclient //windowsMachineName/Xfer -U username
sort
| command | action |
|---|
|
sort -t '>' -k 2.1
|
Sorts from the key field 2 starting at character 1, using > as the
delimiter when finding the key field
So lines like this:
http://www.google.com/search?hl -> /notes/antivirus.html
would be sorted by their part like this:
/notes/antivirus.html
|
cut
|
command
|
action
|
|
cut -c 10-
|
Removes the first 10 chars of each line
|
|
cut -d '>' -f 2
|
uses > as the field delimiter, and shows only field 2
in:
http://www.google.com/search?hl -> /notes/antivirus.html
out:
/notes/antivirus.html
|
find
Good reference: http://linux.die.net/man/1/find
find . -print find . -name '*.jar' -print find . -name '*.jar' -exec jar -tvf {} \;
Skipping files
Inspired by http://www.cyberciti.biz/faq/find-command-exclude-ignore-files/
# Skips .png .css .gif and .js files then does a grep on the files it finds
find . -type f \( ! -iname "*.png" ! -iname "*.css" ! -iname "*.gif" ! -iname "*.js" \) -exec grep -Hi whatever {} \;
sed
external
tar
# copy a directory using tar. # This copies links (instead of what they point to)
# This was used under Solaris: cd {sourcedirectory} tar cpf - | (cd {dest directory}
&& tar -xvpBf - ) # for example: cd ~/junk/saveme tar cpf - | (cd ~/preserve &&
tar -xvpBf - )