Linux

Automount NFS Share in Linux Using Autofs

Autofs is a service in Linux like operating system which automatically mounts the file system and remote shares when it is accessed. Main advantage of autofs is that you don’t need to mount file system at all time, file system is only mounted when it is in demand.

Autofs service reads two files Master map file ( /etc/auto.master ) and a map file like /etc/auto.misc or /etc/auto.xxxx.

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Linux

Install Perl PAR::Packer

Online Installation

Install Necessary RPMs

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[root]# yum install perl-ExtUtils-Embed
[root]# yum install perl-Crypt-OpenSSL*
[root]# yum install openssl*
[root]# yum install perl-CPAN

Install Required Perl Modules

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[root]# perl -MCPAN -e 'install Filter::Crypto'
[root]# perl -MCPAN -e 'install ExtUtils::CBuilder'
[root]# perl -MCPAN -e 'install PAR::Packer'

It will might report Errors when installing PAR::Packer. You must install the missing Perl package prior to installation of PAR::Packer.

Offline Installation

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Linux

Script: Add a Linux User 

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#!/bin/bash
# Script to add a user to Linux system
# -------------------------------------------------------------------------
# Copyright (c) 2007 nixCraft project <http://bash.cyberciti.biz/>
# This script is licensed under GNU GPL version 2.0 or above
# Comment/suggestion: <vivek at nixCraft DOT com>
# -------------------------------------------------------------------------
# See url for more info:
# http://www.cyberciti.biz/tips/howto-write-shell-script-to-add-user.html
# -------------------------------------------------------------------------
if [ $(id -u) -eq 0 ]; then
	read -p "Enter username : " username
	read -s -p "Enter password : " password
	egrep "^$username" /etc/passwd >/dev/null
	if [ $? -eq 0 ]; then
		echo "$username exists!"
		exit 1
	else
		pass=$(perl -e 'print crypt($ARGV[0], "password")' $password)
		useradd -m -p $pass $username
		[ $? -eq 0 ] && echo "User has been added to system!" || echo "Failed to add a user!"
	fi
else
	echo "Only root may add a user to the system"
	exit 2
fi
Linux

Install Perl Module

List all installed Perl modules
perldoc perllocal or instmodsh

Check if a specified module is installed
perldoc -li math::round # -l = list; -i = ignore case

Install Perl modules
Given an example of Math::Round to be installed

  1. Search & download the module (Math-Round-0.07.tar.gz) at https://metacpan.org/.
  2. Install the module
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    % tar xvf Math-Round-0.07.tar.gz`
    % perl Makefile.PL
    % make
    % make test
    % sudo make install
VLSI

Integrate SOS in Virtuoso

To get Cliosoft SOS integrated in Cadence Virtuoso, what you need to do is just to put 3 files in your $HOME (~/).

1) .cdsinit

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% cat ~/.cdsinit
let( (clioDir)
  clioDir = getShellEnvVar("CLIOSOFT_DIR")
  load((strcat clioDir "/scripts/cds_sosviadfII.il"))
)

2) cdsLibMgr.il

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% cat ~/cdsLibMgr.il
let( (clioDir)
  clioDir = getShellEnvVar("CLIOSOFT_DIR")
  load((strcat clioDir "/scripts/cdsLibMgr.il"))
)

3) cdsinfo.tag

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% cat ~/cdsinfo.tag
DMTYPE sos
Linux

Linux Command: Ip

ip 是个命令， ip 命令的功能很多！基本上它整合了 ifconfig 与 route 这两个命令，不过 ip 的功能更强大。

ip命令用法

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% sudo ip
Usage: ip [ OPTIONS ] OBJECT { COMMAND | help }
       ip [ -force ] -batch filename
where  OBJECT := { link | addr | addrlabel | route | rule | neigh | ntable |
                   tunnel | maddr | mroute | mrule | monitor | xfrm | token }
       OPTIONS := { -V[ersion] | -s[tatistics] | -d[etails] | -r[esolve] |
                    -h[uman-readable] | -iec |
                    -f[amily] { inet | inet6 | ipx | dnet | link } |
                    -o[neline] | -t[imestamp] | -b[atch] [filename] |
                    -rc[vbuf] [size]}

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