Script – nixCraft

Linux shell script to reduce PDF file size

in File-management, Script last updated November 27, 2019

Here is a handy and useful Linux and Unix shell script that reduce PDF file size using Ghostscript. No need to upload your PDF file to the shady third-party website. Just do it from the terminal. I tested it with both CentOS and Ubuntu/Debian Linux.

Simple Shell Script To Wake Up NAS Devices Using Linux or Unix Computer

in Script last updated March 30, 2013

A simple shell to Wake Up nas devices / home servers using Linux and Unix command line.

Shell Script To Transfer Image & Video Files From Any Camera and Rename Them According To Date Taken

in Script last updated January 7, 2009

A Shell Script To Transfer image and video files from any camera and rename them according to the date taken.

Shell Script Beep Media Player Display Currently Playing MP3 File

in Script last updated December 30, 2008

Shell Script To Display MP3 file name currently playing using beep media player.

Shell / sed Program To Remove All C and C++ Comments From Program File

in Academic, Script last updated May 6, 2008

Write the shell / sed program which remove all the comments from a simple C program stored in your current directory. You can assume that the c source code contains only syntactically correct comments:
+ start with // and end with a newline

+ starting with /* and ending */ (can be multiline)

+ nesting of comments is not allowed

Make sure that C source is not changed at all.

How do I use this sed script?

$ ./script.sed < input.c $ ./script.sed < input.c > output.c $ for c in *.c; do script.sed < $c > /tmp/zyzcc.c; /bin/cp -f /tmp/zyzcc.c $c; done

Sample sed code to remove all comments from sed

#! /bin/sed -nf

# Remove C and C++ comments, by Brian Hiles (brian_hiles@rocketmail.com)

# Sped up (and bugfixed to some extent) by Paolo Bonzini (bonzini@gnu.org)
# Works its way through the line, copying to hold space the text up to the
# first special character (/, ", ').  The original version went exactly a
# character at a time, hence the greater speed of this one.  But the concept
# and especially the trick of building the line in hold space are entirely
# merit of Brian.

:loop

# This line is sufficient to remove C++ comments!
/^\/\// s,.*,,

/^$/{
  x
  p
  n
  b loop
}
/^"/{
  :double
  /^$/{
    x
    p
    n
    /^"/b break
    b double
  }

  H
  x
  s,\n\(.[^\"]*\).*,\1,
  x
  s,.[^\"]*,,
  
  /^"/b break
  /^\\/{
    H
    x
    s,\n\(.\).*,\1,
    x
    s/.//
  }
  b double
}

/^'/{
  :single
  /^$/{
    x
    p
    n
    /^'/b break
    b single
  }
  H
  x
  s,\n\(.[^\']*\).*,\1,
  x
  s,.[^\']*,,
  
  /^'/b break
  /^\\/{
    H
    x
    s,\n\(.\).*,\1,
    x
    s/.//
  }
  b single
}

/^\/\*/{
  s/.//
  :ccom
  s,^.[^*]*,,
  /^$/ n
  /^\*\//{
    s/..//
    b loop
  }
  b ccom
}

:break
H
x
s,\n\(.[^"'/]*\).*,\1,
x
s/.[^"'/]*//
b loop

#! /bin/sed -nf

# Remove C and C++ comments, by Brian Hiles (brian_hiles@rocketmail.com)

# Sped up (and bugfixed to some extent) by Paolo Bonzini (bonzini@gnu.org)

# Works its way through the line, copying to hold space the text up to the

# first special character (/, ", '). The original version went exactly a

# character at a time, hence the greater speed of this one. But the concept

# and especially the trick of building the line in hold space are entirely

# merit of Brian.

:loop

# This line is sufficient to remove C++ comments!

/^\/\// s,.*,,

/^$/{

b loop

}

/^"/{

:double

/^$/{

/^"/b break

b double

}

s,\n$.[^\"]*$.*,\1,

s,.[^\"]*,,

/^"/b break

/^\\/{

s,\n$.$.*,\1,

s/.//

}

b double

}

/^'/{

:single

/^$/{

/^'/b break

b single

}

s,\n$.[^\']*$.*,\1,

s,.[^\']*,,

/^'/b break

/^\\/{

s,\n$.$.*,\1,

s/.//

}

b single

}

/^\/\*/{

s/.//

:ccom

s,^.[^*]*,,

/^$/ n

/^\*\//{

s/..//

b loop

}

b ccom

}

:break

s,\n$.[^"'/]*$.*,\1,

s/.[^"'/]*//

b loop

Please note that this program is copied from public domain.

Shell Script to Start and Login via Netgear WG311 Marvell 88w8335 Wireless Card

in Script last updated April 24, 2008

A Shell Script To Login To PreConfigured Wireless Network Via Netgear WG311 Marvell 88w8335 Rev 03 Chipset Wireless Card.

Shell Script To Read IP Address ( Find Ip Address Script )

in Script last updated April 10, 2008

#!/bin/sh
# Shell script scripts to read ip address
# -------------------------------------------------------------------------
# Copyright (c) 2005 nixCraft project <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# -------------------------------------------------------------------------
# Get OS name
OS=`uname`
IO="" # store IP
case $OS in
   Linux) IP=`ifconfig  | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`;;
   FreeBSD|OpenBSD) IP=`ifconfig  | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'` ;;
   SunOS) IP=`ifconfig -a | grep inet | grep -v '127.0.0.1' | awk '{ print $2} '` ;;
   *) IP="Unknown";;
esac
echo "$IP"

#!/bin/sh

# Shell script scripts to read ip address

# -------------------------------------------------------------------------

# This script is licensed under GNU GPL version 2.0 or above

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# -------------------------------------------------------------------------

# Get OS name

OS=`uname`

IO="" # store IP

case $OS in

Linux) IP=`ifconfig | grep 'inet addr:'| grep -v '127.0.0.1' | cut -d: -f2 | awk '{ print $1}'`;;

FreeBSD|OpenBSD) IP=`ifconfig | grep -E 'inet.[0-9]' | grep -v '127.0.0.1' | awk '{ print $2}'` ;;

SunOS) IP=`ifconfig -a | grep inet | grep -v '127.0.0.1' | awk '{ print $2} '` ;;

*) IP="Unknown";;

esac

echo "$IP"

Shell Script to stop DLink PCI wireless lan card DWL 520 (Debian Linux)

in Script last updated April 10, 2008

#!/bin/sh
# Script to stop DLink PCL wireless lan card DWL 520
# ----------------------------------------------------------------
# Copyright (c) 2006 nixCraft <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# See url for more info:
# https://www.cyberciti.biz/tips/linux-install-and-configure-dlink-dwl-g-520-wireless-lan-pci-card.html
# -------------------------------------------------------------------------

# unload driver (DLink 520/rt61)
rmmod rt61

#clear firwall
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X

# append your other stuff below

#!/bin/sh

# Script to stop DLink PCL wireless lan card DWL 520

# ----------------------------------------------------------------

# This script is licensed under GNU GPL version 2.0 or above

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# See url for more info:

# https://www.cyberciti.biz/tips/linux-install-and-configure-dlink-dwl-g-520-wireless-lan-pci-card.html

# -------------------------------------------------------------------------

# unload driver (DLink 520/rt61)

rmmod rt61

#clear firwall

iptables -F

iptables -X

iptables -t nat -F

iptables -t nat -X

iptables -t mangle -F

iptables -t mangle -X

# append your other stuff below

Shell Script to start DLink PCL wireless lan card 520 / 510

in Script last updated April 10, 2008

#!/bin/sh
# Script to start DLink PCL wireless lan card 520 
# ----------------------------------------------------------------
# Copyright (c) 2006 nixCraft <http://cyberciti.biz/fb/>
# This script is licensed under GNU GPL version 2.0 or above
# -------------------------------------------------------------------------
# This script is part of nixCraft shell script collection (NSSC)
# Visit http://bash.cyberciti.biz/ for more information.
# See url for more info:
# https://www.cyberciti.biz/tips/linux-install-and-configure-dlink-dwl-g-520-wireless-lan-pci-card.html
# -------------------------------------------------------------------------

# assing values 
# use 'iwlist ra0 scanning' command to get values
SSID=nixcraft
TYPE=Managed
CHANNEL=6
KEY="your-key"
INET=ra0
IWC="/sbin/iwconfig"

# ok config ra0
$IWC $INET essid $SSID
$IWC $INET mode $TYPE
$IWC $INET channel $CHANNEL
$IWC $INET key $KEY

# firewall 
iptables -F
iptables -X
iptables -t nat -F
iptables -t nat -X
iptables -t mangle -F
iptables -t mangle -X
modprobe ip_conntrack
modprobe ip_conntrack_ftp

# Setting default filter policy
iptables -P INPUT DROP
iptables -P OUTPUT ACCEPT

# Unlimited access to loop back
iptables -A INPUT -i lo -j ACCEPT
iptables -A OUTPUT -o lo -j ACCEPT

# Allow UDP, DNS and Passive FTP
iptables -A INPUT -i $INET -m state --state ESTABLISHED,RELATED -j ACCEPT

#allow bittorent incomming client request :)
iptables -A INPUT -p tcp --destination-port 6881:6882 -j ACCEPT

#Uncomment below to allow sshd incoming client request
#iptables -A INPUT -p tcp --destination-port 22 -j ACCEPT

# DROP everything and Log it
iptables -A INPUT -j LOG
iptables -A INPUT -j DROP

#!/bin/sh

# Script to start DLink PCL wireless lan card 520

# ----------------------------------------------------------------

# This script is licensed under GNU GPL version 2.0 or above

# -------------------------------------------------------------------------

# This script is part of nixCraft shell script collection (NSSC)

# Visit http://bash.cyberciti.biz/ for more information.

# See url for more info:

# https://www.cyberciti.biz/tips/linux-install-and-configure-dlink-dwl-g-520-wireless-lan-pci-card.html

# -------------------------------------------------------------------------

# assing values

# use 'iwlist ra0 scanning' command to get values

SSID=nixcraft

TYPE=Managed

CHANNEL=6

KEY="your-key"

INET=ra0

IWC="/sbin/iwconfig"

# ok config ra0

$IWC $INET essid $SSID

$IWC $INET mode $TYPE

$IWC $INET channel $CHANNEL

$IWC $INET key $KEY

# firewall

iptables -F

iptables -X

iptables -t nat -F

iptables -t nat -X

iptables -t mangle -F

iptables -t mangle -X

modprobe ip_conntrack

modprobe ip_conntrack_ftp

# Setting default filter policy

iptables -P INPUT DROP

iptables -P OUTPUT ACCEPT

# Unlimited access to loop back

iptables -A INPUT -i lo -j ACCEPT

iptables -A OUTPUT -o lo -j ACCEPT

# Allow UDP, DNS and Passive FTP

iptables -A INPUT -i $INET -m state --state ESTABLISHED,RELATED -j ACCEPT

#allow bittorent incomming client request :)

iptables -A INPUT -p tcp --destination-port 6881:6882 -j ACCEPT

#Uncomment below to allow sshd incoming client request

#iptables -A INPUT -p tcp --destination-port 22 -j ACCEPT

# DROP everything and Log it

iptables -A INPUT -j LOG

iptables -A INPUT -j DROP