. 
This is a list of some handy/common things you can do on the command line in Linux.
Commands
lynx -dump -width=999 http://www.linuxhowtos.org/Misc/commandline.htm >cmd.txt Make a text copy of this page
apropos word show commands pertinent to word
which command show full path name of command
time command see how long a command takes
nice command run a low priority command
renice 19 -p $$ make shell (script) low priority. Useful for non interactive tasks
look prefix quickly search dictionary
grep --color word /usr/share/dict/words highlight occurances of words in dictionary
gpg -c file encrypt file
gpg file.gpg decrypt file
echo 'wget url' | at 01:00 download url at 1AM to current dir
echo "mail -s 'get the train' you@yourdomain < /dev/null" | at 17:45 email reminder
watch -n1 'cat /proc/interrupts' watch changeable data continuously
alias hd='od -Ax -tx1z -v' handy hexdump. (usage e.g.: βΆ hd /proc/self/cmdline | less)
disc space
ls /usr/bin | pr -T9 -W$COLUMNS print in 9 columns to width of terminal
touch -c -t 0304050607 file set file timestamp (YYMMDDhhmm)
pstree -hlp show process hierarchy
lsof /dir/file show process using file
ls -lSr show files, biggest last
du -sh file dir show disk usage of file and dir. See also dutop
df -h free disk space
df -i free inodes
fdisk -l show disks partitions sizes (run as root)
rpm -q -a --queryformat '%10{SIZE} %{NAME}' | sort -k1,1nlist all packages by size
Dir navigation
cd - go to previous directory
cd ~ go to home directory
(cd dir && command) go to dir, execute command and return to current dir
pushd . put current dir on stack so you can popd back to it
CDs
gzip < /dev/cdrom > cdrom.iso.gz save copy of data cdrom
mkisofs -r dir | gzip > cdrom.iso.gz create cdrom image from directory
mount -oloop cdrom.iso /mnt/dir mount the cdrom image at /mnt/dir (for browsing)
gzip -dc cdrom.iso.gz | cdrecord dev=/dev/cdrom - burn cdrom image (use dev=ATAPI -scanbus to confirm dev)
cdparanoia -B rip audio tracks from CD to wav files in current dir
cdrecord dev=/dev/cdrom -audio *.wav make audio CD from all wavs in current dir
oggenc --tracknum='track' track.cdda.wav -o 'track.ogg' make ogg file from wav file
archives
tar c dir/ | bzip2 > dir.tar.bz2 make archive of dir/
bzip2 -dc dir.tar.bz2 | tar x extract archive (use gzip instead of bzip2 for tar.gz files)
tar c dir/ | gzip | gpg -c | ssh user@remote 'dd of=dir.tar.gz.gpg' make encrypted archive of dir/ on remote machine
find dir/ -name '*.txt' | tar c --files-from=- | bzip2 > dir_png.tar.bz2 make archive of subset of dir/ and below
find dir/ -name '*.txt' | xargs cp --target-directory=dir_png/ --parents make copy of subset of dir/ and below
( tar c /dir/to/copy ) | ( cd /where/to/ && tar x ) copy (with permissions) copy/ dir to /where/to/ dir
( cd /dir/to/copy && tar c . ) | ( cd /where/to/ && tar x ) copy (with permissions) contents of copy/ dir to /where/to/ dir
( tar c /dir/to/copy ) | ssh -C user@remote 'cd /where/to/ && tar x' copy (with permissions) copy/ dir to remote:/where/to/ dir
dd bs=1M if=/dev/hda | gzip | ssh user@remote 'dd of=hda.gz' backup harddisk to remote machine
rsync (Use the --dry-run option for testing)
rsync -P rsync://rsync.server.com/path/to/file file Only get diffs. Do multiple times for troublesome downloads
rsync --bwlimit=1000 fromfile tofile Locally copy with rate limit. It's like nice for I/O
rsync -az -e ssh --delete ~/public_html/ remote.com:'~/public_html' Mirror web site (using compressed rsync over encrypted ssh)
rsync -auz -e ssh remote:/dir/ . && rsync -auz -e ssh . remote:/dir/ Synchronize current directory with remote one
file searching
alias l='ls -l --color=auto' quick dir listing
ls -lrt list files by date. See also newest
find -name '*.[ch]' | xargs grep -E 'search string' search *.c and *.h for 'search string' in this dir and below
find -type f -print0 | xargs -r0 grep -E 'search string' search all regular files for 'search string' in this dir and below
find -type f -maxdepth 1 | xargs grep -E 'search string' search all regular files for 'search string' in this dir
find -type f ! -perm -444 find files not readable by all (useful for web site)
find -type d ! -perm -111 find dirs not accessible by all (useful for web site)
locate -r 'file[^/]*.txt' search cached index for names. This re is like glob *file*.txt
Networking
(Note ifconfig, route, mii-tool, nslookup commands are obsolete)
ip link show list interfaces
ethtool interface list interface status
ip link set dev eth0 name wan rename eth0 to wan
ip addr add 1.2.3.4/24 brd + dev eth0 add ip and mask(255.255.255.0)
ip link set dev interface up bring interface up (or down)
ip route add default via 1.2.3.254 set default gateway to 1.2.3.254
host google.com lookup ip address for name or vice versa
netstat -lp --inet list internet services on a system
netstat -p --inet list active connections to/from system
echo 'message' | smbclient -M netbiosname Send popup to windows machine (off by default as of XP sp2)
Math
echo '(1 + sqrt(5))/2' | bc -l quick math
echo 'obase=16; ibase=10; 123' | bc base conversion (decimal to hex)
echo 'pad=20; min=64; (100*10^6)/((pad+min)*8)' | bc More complex (integer) e.g. This shows max FastE packet rate
echo 'pad=20; min=64; print (100E6)/((pad+min)*8)' | python python handles scientific notation
echo 'pad=20; plot [64:1518] (100*10**6)/((pad+x)*8)' | gnuplot -persist Plot FastE packet rate vs packet size
text manipulation
(note these use stdin and stdout, so if you want to edit files, append newfile)
sed 's/string1/string2/g' replace string1 with string2
sed '/ *#/d; /^ *$/d' remove comments and blank lines
sed ':a; /\$/N; s/\//; ta' concatenate lines with trailing
sed 's/[ ]*$//' remove trailing spaces from lines
sed 's/([\`\"$\\])/\1/g' backslashify shell metacharacters active within double-quotes
sort file1 file1 file2 | uniq -u show lines in file2 not in file1
echo 'Test' | tr '[:lower:]' '[:upper:]' case conversion
tr -dc '[:print:]' < /dev/urandom filter non printable characters
grep 'processor' /proc/cpuinfo | wc -l count lines
Calendar
cal -3 display a calendar
date --date='25 Dec' +%A what day does xmas fall on, this year
date --date '1970-01-01 UTC 1097781420 seconds' convert number of seconds since the epoch to a date
TZ=':America/Los_Angeles' date What time is it on West coast of US (use tzselect to find TZ)
locales
printf "%'d" 1234 print number with thousands grouping appropriate to locale
echo "I live in `locale territory`" extract info from locale database
locale | cut -d= -f1 | xargs locale -kc | less list fields in locale database
LANG=ga_IE locale int_prefix lookup locale info for specific country. See also ccodes
recode
(Obsoletes iconv, dos2unix, unix2dos)
recode -l | less show available conversions (aliases on each line)
recode windows-1252.. file_to_change.txt windows "ansi" to local charset (auto does CRLF conversion)
recode utf-8/CRLF.. file_to_change.txt windows utf8 to local charset
recode iso-8859-15..utf8 file_to_change.txt latin9 (western europe) to utf8
recode ../b64 < file.txt > file.b64 Base64 encode
recode ..HTML < file.txt > file.html text to HTML
recode -lf windows-1252 show table of characters
echo -n 0xA4 | recode latin-9/x1..dump show what the character is in charmap
echo -n 0x20AC | recode ucs-2/x2..1252/x show windows-1252 encoding
echo -n 0x20AC | recode ucs-2/x2..utf-8/x show utf-8 encoding
interactive
mc powerful filemanager that can browse rpm, tar, ftp, ssh, ...
screen virtual terminals with detach capability, ...
lynx web browser
gnuplot interactive/scriptable graphing
octave matlab like environment
From http://www.iol.ie/~padraiga/cmdline.html
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