Cool Commands for Unix and Windows (ZZ)

These are some commands that I use in Windows and Unix/Linux for various purposes.

Windows (//z 2012-2-21 13:42:23 PM IS2120@CSDN)

ipconfig	Show my IP address
ipconfig \all	Show my host name, IP addr, MAC addr, subnet mask, DNS servers, etc.
netstat	List all TCP connections
netstat -a	List all active ports
nslookup host	Get IP addr for host
ping host	See if a host is accessible

Unix/Linux

System related
uptime	Show how long the system has been up
uname -a	Show the OS name and version
hostname	Shows the machine's name
ps -f -u username	Lists all the processes I'm running
echo $0	Shows what shell I'm using
echo $path	Shows my path (or any environment variable)
Network related
netstat	List all TCP connections
netstat -a	List all active ports
nslookup host	Get IP addr for host
ping host	See if a host is accessible
telnet domain_name 80	Use telnet to make an HTTP request Example to view http://www.harding.edu/comp/: telnet www.harding.edu 80 GET /comp/ HTTP/1.1 Host: www.harding.edu
Disk space (//z 2012-2-21 13:42:23 PM IS2120@CSDN)
df	Shows the amount of disk space in use
df /node_or_dirname	Shows detailed information about the file system node or dir name
du	Shows the amount of disk space used in every dir from current location
du -ks ~fmccown	Shows the amount of disk space user fmccown is using (in KB)
cd;du -k | sort -nr | more	Shows the disk space used (in KB) for every directory in sorted order
File processing
file myfile	Short summary of what type of file myfile is
cat file1 file2 > file3	Concatenates file1 and file2 and stores the result in file3
sort file.txt	Sorts a file
uniq file.txt	Remove duplicate lines from a sorted file
wc file.txt	Counts number of lines, words, and characters in a file
grep search_str file.txt	Search for a search_str in a files
tail -f file.txt	List the contents of a file as it is being added to
tail -n 100 file.txt	List the last 100 lines of a file
find . -name "*html"	Find all files named *html starting in the current dir
find . -exec grep "hello" '{}' \; -print	Run grep on all files starting in the current dir
cat myfile | hexdump -C	Produce a hexdump of myfile
File compression
tar cfz my.tar.gz *.html	Creates a gzipped tar file for all .html files
tar -tzf my.tar.gz	Lists the contents of my.tar.gz
tar xvfz my.tar.gz	Uncompresses and untars my.tar.gz
gzip myfile.txt	Compresses myfile.txt creating myfile.txt.gz
gzip -d myfile.txt.gz	Uncompresses myfile.txt.gz creating myfile.txt
bzip2 myfile.txt	Compresses myfile.txt creating myfile.txt.bz2 (Use -k to keep myfile.txt)
bzip2 -d myfile.txt.bz2	Uncompresses myfile.txt.bz2 creating myfile.txt
I/O redirection
cmd > log.txt	Redirect cmd output (stdout) to log.txt
cmd >> log.txt	Append stdout to log.txt
cmd 1> out_log.txt 2> err_log.txt	Send stdout to out_log.txt and stderr to err_log.txt
cmd &> log.txt	Redirect stdout and stderr to log.txt. Note: use >& for C shell.
Running processes
./cmd &	Run process in the background
nohup ./cmd &	Run process in the background, and don't terminate when shell is terminated

//z 2012-2-21 13:42:23 PM IS2120@CSDN