Linux Commands: Difference between revisions

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(xsel / xselection)
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socat -ly # Writes messages to syslog instead of stderr; severity as defined with option -d
socat -ly # Writes messages to syslog instead of stderr; severity as defined with option -d
socat -v # Writes the transferred data to their target stream but also to stderr (text mode)
socat -v # Writes the transferred data to their target stream but also to stderr (text mode)
</source>

== XSel / XSelection ==
'''[http://www.vergenet.net/~conrad/software/xsel/ XSel]''' is a command-line program for getting and setting the contents of the X selection and context-menu clipboard. Normally the former is only accessible by manually highlighting information and pasting it with the middle mouse button, and the latter is only accessible by using context-menu cut/copy/paste command.

'''xselection''' is an equivalent package on OpenSUSE.

On [[Cygwin]], one has to use <tt>getclip</tt>, <tt>putclip</tt> or device <tt>/dev/clipboard</tt>.

<source lang="bash">
xsel -p # To get content of PRIMARY buffer (X selection)
xselection PRIMARY # (equivalent command for xselection)
xsel -b # To get content of CLIPBOARD (context-menu clipboard)
xselection CLIPBOARD # (equivalent command for xselection)
echo sometext | xsel -p # To set PRIMARY buffer
xselection PRIMARY sometext # (equivalent command for xselection)
echo sometext | xsel -b # To set CLIPBOARD buffer
xselection CLIPBOARD sometext # (equivalent command for xselection)
</source>
</source>


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;[http://freshmeat.net/projects/xclip/ xclip]
;[http://freshmeat.net/projects/xclip/ xclip]
:xclip is a command line interface to the X11 clipboard. It can also be used for copying files, as an alternative to sftp/scp, thus avoiding password prompts when X11 forwarding has already been setup. [http://gnuisance.net/blog/t/2007/xclip.html Check this guide].
:xclip is a command line interface to the X11 clipboard. It can also be used for copying files, as an alternative to sftp/scp, thus avoiding password prompts when X11 forwarding has already been setup. [http://gnuisance.net/blog/t/2007/xclip.html Check this guide].
;[http://www.vergenet.net/~conrad/software/xsel/ XSel]
:XSel is a command-line program for getting and setting the contents of the X selection (aka clipboard). Normally this is only accessible by manually highlighting information and pasting it with the middle mouse button.
;xselection
:Another package similar to ''xsel''. But I can't get it work correctly on OpenSUSE...
;xxd
;xxd
:Make a hexdump or do the reverse
:Make a hexdump or do the reverse

Revision as of 00:10, 1 February 2009

dd

Convert and copy a file.

dd returns current copy status when sent an HUP signal. Type in another shell:

while :; sleep 5; do killall -s SIGHUP1 dd; done

This will force dd to update its status every 5sec.

dpkg

Package manager for Debian / Ubuntu. See Package Management#Ubuntu / Debian

echo

echo -e "Some text\n...on 2 lines..."                    # Enable interpretation of backslash escapes (must be quoted!)

find

See here for further examples on how to combine find and xargs.

find . -name "*.jpg"                                     # find files/directories whose name matches specified pattern
find . -path "*/cur/*"                                   # find files/directories whose path spec matches specified pattern
find . -type d -name "cur"                               # find only directories whose name matches specified pattern
find . -exec echo '{}' \;                                # semi-colon must be escaped!
find . -exec echo one '{}' \; -exec echo two '{}' \;     # to execute several commands on one match
find . -name \*.jpg | xargs echo                         # much faster version using xargs
find . -name \*.jpg | xargs -n 2 echo                    # limit #args passed to echo to 2 max.
find . -name \*.jpg -print0 | xargs -0 ls                # Use NULL separator if files contains space or special char !!!

grep

grep -Rsl PATTERN [FILE]            # Recursive, no error output, only list filename
grep BASIC-REG-EXP-PATTERN [FILE]   # Use classic regexp (like "dma\|DMA")
egrep EXT-REG-EXP-PATTERN [FILE]    # Same as grep -E. Use extended regexp (like "dma|DMA")
fgrep FIXED-STRINGS-REG-EXP [FILE]  # Same as grep -F. Pattern is a list of strings to match.
grep -n PATTERN [FILE]              # Print matched line numbers.
grep -- "-s" [FILE]                 # Search for text "-s"
grep -e "-s" [FILE]                 # Search for text "-s" - alternative solution
grep -R -include=*.in PATTERN *     # Search recursively through folders, limiting to files matching pattern "*.in"
grep -R PATTERN *.in                # Idem, but matching pattern "*.in" also applies to folders.
grep -o PATTERN [FILE]              # (--only-matching) Print only the matched (non-empty) parts of a matching line.

multitee

multitee sends multiple inputs to multiple outputs.
Check this page.
Original is here, or can also be found here on Debian.

Here a patch to build it on Cygwin. The patch ports calls to BSD signal.h API (struct sigvec, sigvec(), sigmask(), sigblock()...) to the POSIX API (struct sigaction, sigaction(), sigprocmask(), sigfillset()...):

$ patch -Np1 <../multitee-3.0-cygwin.patch
$ make
$ cp multitee.1 /usr/local/man/man1
$ cp multitee.exe /usr/local/bin

Example of use:

$ multitee 0-1,4,5 4> foo 5> bar             # same as tee foo bar with better blocking behavior
$ multitee 0:1 3:1 4:1,2 6:7                 # various merge and copy
$ tcpclient server smtp multitee 0:7 6:1e0   # e0 tell multitee to quit as soon connection close
$ multitee 0:3 3:1                           # same as 'socat - FD:3'

netcat

TCP-IP swiss army knife (equivalent of the telnet program. Check wikipedia:netcat. Also known as command nc).

netstat

Print network connections, routing tables, interface statistics, masqurade connections, and multicast memberships

netstat -utpn      #Active ports, tcp, socket program PID, numeric
netstat -lutpn     #Listen ports, tcp, socket program PID, numeric
netstat -autpn     #All (active and listen), tcp, socket program PID, numeric
netstat -rn        #Kernel route table, numeric

When listing sockets (default output), you'll get an output like:

% netstat -at

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 *:time                  *:*                     LISTEN
tcp        0      0 localhost:mysql         *:*                     LISTEN
tcp        0      0 andLinux.local:43449    windows-host:x11        ESTABLISHED
% netstat -atn

Active Internet connections (servers and established)
Proto Recv-Q Send-Q Local Address           Foreign Address         State
tcp        0      0 0.0.0.0:37              0.0.0.0:*               LISTEN
tcp        0      0 127.0.0.1:3306          0.0.0.0:*               LISTEN
tcp        0      0 192.168.11.150:43449    192.168.11.1:6000       ESTABLISHED
Local Address
* or 0.0.0.0 means that the process accepts connection from any interface.
127.0.0.1 means it only accepts connection on localhost loopback (and so only connection that originates from local PC as well).
Any other IP address means that the process listen on the given port at the given IP address

recode

recode /cl../cr <dos.txt >mac.txt
recode /cr.. <mac.txt >unix.txt
recode ../cl <unix.txt >dos.txt
recode charset1/surface1..charset2/surface2 <input.txt >output.txt
recode /QP.. <qp.txt >normal.txt                                    # To convert quoted-printable text
charset surface
us ASCII (7 bits) /cr Carriage return as end of line (Mac text)
l1 ISO Latin-1 (ISO-8859-1, Western Europe, 8 bits) /cl Carriage return line feed as end of line (DOS text)
EUCJP EUC-JP for Japanese (Unix) / Line feed as end of line (Unix text)
SJIS Shift-JIS for Japanese (Microsoft) /d1 Human readable bytewise decimal dump
ISO2022JP Mail encoding for Japanese (7 bits) /x1 Human readable bytewise hexidecimal dump
u2 UCS-2 (Universal Character Set, 2 bytes) /64 Base64 encoded text
u8 UTF-8 (Universal Transformation Format, 8 bits) /QP Quoted-Printable encoded text

rpm

See Package Management#RPM's

sed

Moved to page dedicated to Sed.

socat

Command-line utility that establishes two bidirectional byte streams and transfers data between them ([1]). socat is the more powerful version of netcat. Check the homepage.

socat -ly 'TCP4-LISTEN:143,reuseaddr,fork' PROXY:ton.imap.server:143|TCP:134.27.168.36:8080
ProxyCommand socat - 'PROXY:%h:%p,proxyauth=user:pass|SSL,verify=0|PROXY:my.server:443,proxyauth=user:pass|TCP:big.brother.proxy:8080'     # Using v2.0.0 beta

socat can be easily used as a replacement of telnet:

socat tcp:<host>:<port> -       # <port> can be a port number or service name (telnet,imap...)

Some useful command-line options:

socat -ly                       # Writes messages to syslog instead of stderr; severity as defined with option -d
socat -v                        # Writes the transferred data to their target stream but also to stderr (text mode)

XSel / XSelection

XSel is a command-line program for getting and setting the contents of the X selection and context-menu clipboard. Normally the former is only accessible by manually highlighting information and pasting it with the middle mouse button, and the latter is only accessible by using context-menu cut/copy/paste command.

xselection is an equivalent package on OpenSUSE.

On Cygwin, one has to use getclip, putclip or device /dev/clipboard.

xsel -p                         # To get content of PRIMARY buffer (X selection)
xselection PRIMARY              # (equivalent command for xselection)
xsel -b                         # To get content of CLIPBOARD (context-menu clipboard)
xselection CLIPBOARD            # (equivalent command for xselection)
echo sometext | xsel -p         # To set PRIMARY buffer
xselection PRIMARY sometext     # (equivalent command for xselection)
echo sometext | xsel -b         # To set CLIPBOARD buffer
xselection CLIPBOARD sometext   # (equivalent command for xselection)

Miscellaneous

htop
an improved top command
iconv
locale encoding conversions
konwert
fancy encoding conversions
mimencode
binary file conversion for the mail.;mkfifo
make FIFOs (named pipes)
pv, pipeview, pipebench
monitor the progress of data through a pipe
reformime
MIME E-mail reformatting tool
stat
display file or file system status
strace
trace system calls and signals
tee
read from standard input and write to standard output and files
tree
List the contents of directories in a tree-like format.
uuencode, uudecode
binary file conversion for Unix.
watch
Execute a program periodically, showing output full screen
xclip
xclip is a command line interface to the X11 clipboard. It can also be used for copying files, as an alternative to sftp/scp, thus avoiding password prompts when X11 forwarding has already been setup. Check this guide.
xxd
Make a hexdump or do the reverse
$ echo 202122 | xxd -r -ps -                 # To decode a hexdump string
$ echo ' !"' | xxd -u -ps -                  # to code as a hexdump string (uppercase)