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find
• 
finger
• 
• flex
flock
• 
fmt
• 
fold
• 
free
• 
fsck
• 
• ftp
fuser
• 
getfacl
• 
getopt
• 
getopts
• 
gettext
• 
getty
• 
gnome-mount
• 
grep
• 
groff
• 
groupmod
• 
groups (Related topic: the $GROUPS variable)
• 
• gs
gzip
• 
halt
• 
hash
• 
hdparm
• 
head
• 
help
• 
hexdump
• 
host
• 
hostid
• 
hostname (Related topic: the $HOSTNAME variable)
• 
hwclock
• 
iconv
• 
id (Related topic: the $UID variable)
• 
ifconfig
• 
info
• 
infocmp
• 
• init
insmod
• 
install
• 
• ip
ipcalc
• 
iptables
• 
iwconfig
• 
jobs
• 
• join
• jot
• kill
killall
• 
last
• 
lastcomm
• 
Advanced Bash-Scripting Guide
Part 4. Commands
175
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lastlog
• 
• ldd
less
• 
• let
• lex
• lid
• ln
locate
• 
lockfile
• 
logger
• 
logname
• 
logout
• 
logrotate
• 
look
• 
losetup
• 
• lp
• ls
lsdev
• 
lsmod
• 
lsof
• 
lspci
• 
lsusb
• 
ltrace
• 
lynx
• 
lzcat
• 
lzma
• 
• m4
mail
• 
mailstats
• 
mailto
• 
make
• 
MAKEDEV
• 
man
• 
mapfile
• 
mcookie
• 
md5sum
• 
merge
• 
mesg
• 
mimencode
• 
mkbootdisk
• 
mkdir
• 
mkdosfs
• 
mke2fs
• 
mkfifo
• 
mkisofs
• 
mknod
• 
mkswap
• 
mktemp
• 
mmencode
• 
modinfo
• 
modprobe
• 
Advanced Bash-Scripting Guide
Part 4. Commands
176
.NET PDF Document Viewing, Annotation, Conversion & Processing
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more
• 
mount
• 
msgfmt
• 
• mv
• nc
netconfig
• 
netstat
• 
newgrp
• 
nice
• 
• nl
• nm
nmap
• 
nohup
• 
nslookup
• 
objdump
• 
• od
openssl
• 
passwd
• 
paste
• 
patch (Related topic: diff)
• 
pathchk
• 
• pax
pgrep
• 
pidof
• 
ping
• 
pkill
• 
popd
• 
• pr
printenv
• 
printf
• 
procinfo
• 
• ps
pstree
• 
• ptx
pushd
• 
pwd (Related topic: the $PWD variable)
• 
quota
• 
• rcp
rdev
• 
rdist
• 
read
• 
readelf
• 
readlink
• 
readonly
• 
reboot
• 
recode
• 
renice
• 
reset
• 
resize
• 
restore
• 
• rev
Advanced Bash-Scripting Guide
Part 4. Commands
177
C# powerpoint - PowerPoint Conversion & Rendering in C#.NET
using other external third-party dependencies like Adobe Acrobat. you may easily achieve the following PowerPoint file conversions PowerPoint to PDF Conversion.
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C# Word - Word Conversion in C#.NET
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rlogin
• 
• rm
rmdir
• 
rmmod
• 
route
• 
• rpm
rpm2cpio
• 
• rsh
rsync
• 
runlevel
• 
run-parts
• 
• rx
• rz
• sar
• scp
script
• 
sdiff
• 
• sed
• seq
service
• 
• set
setfacl
• 
setquota
• 
setserial
• 
setterm
• 
sha1sum
• 
shar
• 
shopt
• 
shred
• 
shutdown
• 
size
• 
skill
• 
sleep
• 
slocate
• 
snice
• 
sort
• 
source
• 
• sox
split
• 
• sq
• ssh
stat
• 
strace
• 
strings
• 
strip
• 
• stty
• su
sudo
• 
• sum
suspend
• 
swapoff
• 
Advanced Bash-Scripting Guide
Part 4. Commands
178
VB.NET PDF: How to Create Watermark on PDF Document within
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C# Windows Viewer - Image and Document Conversion & Rendering in
without using other external third-party dependencies like Adobe Acrobat. library toolkit in C#, you can easily perform file conversion from Convert to PDF.
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swapon
• 
• sx
sync
• 
• sz
• tac
• tail
• tar
• tbl
tcpdump
• 
• tee
telinit
• 
telnet
• 
• Tex
texexec
• 
time
• 
times
• 
tmpwatch
• 
• top
touch
• 
tput
• 
• tr
traceroute
• 
true
• 
tset
• 
tsort
• 
• tty
tune2fs
• 
type
• 
typeset
• 
ulimit
• 
umask
• 
umount
• 
uname
• 
unarc
• 
unarj
• 
uncompress
• 
unexpand
• 
uniq
• 
units
• 
unlzma
• 
unrar
• 
unset
• 
unsq
• 
unzip
• 
uptime
• 
usbmodules
• 
useradd
• 
userdel
• 
usermod
• 
users
• 
usleep
• 
Advanced Bash-Scripting Guide
Part 4. Commands
179
VB.NET PowerPoint: VB Code to Draw and Create Annotation on PPT
other documents are compatible, including PDF, TIFF, MS hand, free hand line, rectangle, text, hotspot, hotspot Users need to add following implementations to
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C# Excel - Excel Conversion & Rendering in C#.NET
without using other external third-party dependencies like Adobe Acrobat. you may easily achieve the following Excel file conversions. Excel to PDF Conversion.
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uucp
• 
uudecode
• 
uuencode
• 
• uux
vacation
• 
vdir
• 
vmstat
• 
vrfy
• 
• w
wait
• 
wall
• 
watch
• 
• wc
wget
• 
whatis
• 
whereis
• 
which
• 
who
• 
whoami
• 
whois
• 
write
• 
xargs
• 
xrandr
• 
• xz
yacc
• 
• yes
zcat
• 
zdiff
• 
zdump
• 
zegrep
• 
zfgrep
• 
zgrep
• 
• zip
Table of Contents
15. Internal Commands and Builtins
15.1. Job Control Commands
16. External Filters, Programs and Commands
16.1. Basic Commands
16.2. Complex Commands
16.3. Time / Date Commands
16.4. Text Processing Commands
16.5. File and Archiving Commands
16.6. Communications Commands
16.7. Terminal Control Commands
16.8. Math Commands
16.9. Miscellaneous Commands
17. System and Administrative Commands
17.1. Analyzing a System Script
Advanced Bash-Scripting Guide
Part 4. Commands
180
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Chapter 15. Internal Commands and Builtins
A builtin is a command contained within the Bash tool set, literally built in. This is either for performance
reasons -- builtins execute faster than external commands, which usually require forking off [58] a separate
process -- or because a particular builtin needs direct access to the shell internals.
When a command or the shell itself initiates (or spawns) a new subprocess to carry out a task, this is called
forking. This new process is the child, and the process that forked it off is the parent. While the child
process is doing its work, the parent process is still executing.
Note that while a parent process gets the process ID of the child process, and can thus pass arguments to it,
the reverse is not true. This can create problems that are subtle and hard to track down.
Example 15-1. A script that spawns multiple instances of itself
#!/bin/bash
# spawn.sh
PIDS=$(pidof sh $0)  # Process IDs of the various instances of this script.
P_array=( $PIDS )    # Put them in an array (why?).
echo $PIDS           # Show process IDs of parent and child processes.
let "instances = ${#P_array[*]} - 1"  # Count elements, less 1.
# Why subtract 1?
echo "$instances instance(s) of this script running."
echo "[Hit Ctl-C to exit.]"; echo
sleep 1              # Wait.
sh $0                # Play it again, Sam.
exit 0               # Not necessary; script will never get to here.
# Why not?
#  After exiting with a Ctl-C,
#+ do all the spawned instances of the script die?
#  If so, why?
# Note:
# ----
# Be careful not to run this script too long.
# It will eventually eat up too many system resources.
#  Is having a script spawn multiple instances of itself
#+ an advisable scripting technique.
#  Why or why not?
Generally, a Bash builtin does not fork a subprocess when it executes within a script. An external system
command or filter in a script usually will fork a subprocess.
A builtin may be a synonym to a system command of the same name, but Bash reimplements it internally. For
example, the Bash echo command is not the same as /bin/echo, although their behavior is almost
identical.
Chapter 15. Internal Commands and Builtins
181
#!/bin/bash
echo "This line uses the \"echo\" builtin."
/bin/echo "This line uses the /bin/echo system command."
A keyword is a reserved word, token or operator. Keywords have a special meaning to the shell, and indeed
are the building blocks of the shell's syntax. As examples, for, while, do, and ! are keywords. Similar to a
builtin, a keyword is hard-coded into Bash, but unlike a builtin, a keyword is not in itself a command, but a
subunit of a command construct. [59]
I/O
echo
prints (to stdout) an expression or variable (see Example 4-1).
echo Hello
echo $a
An echo requires the -e option to print escaped characters. See Example 5-2.
Normally, each echo command prints a terminal newline, but the -n option suppresses this.
An echo can be used to feed a sequence of commands down a pipe.
if echo "$VAR" | grep -q txt   # if [[ $VAR = *txt* ]]
then
echo "$VAR contains the substring sequence \"txt\""
fi
An echo, in combination with command substitution can set a variable.
a=`echo "HELLO" | tr A-Z a-z`
See also Example 16-22, Example 16-3, Example 16-47, and Example 16-48.
Be aware that echo `command` deletes any linefeeds that the output of command generates.
The $IFS (internal field separator) variable normally contains \n (linefeed) as one of its set of
whitespace characters. Bash therefore splits the output of command at linefeeds into arguments to
echo. Then echo outputs these arguments, separated by spaces.
bash$ ls -l /usr/share/apps/kjezz/sounds
-rw-r--r--    1 root     root         1407 Nov  7  2000 reflect.au
-rw-r--r--    1 root     root          362 Nov  7  2000 seconds.au
bash$ echo `ls -l /usr/share/apps/kjezz/sounds`
total 40 -rw-r--r-- 1 root root 716 Nov 7 2000 reflect.au -rw-r--r-- 1 root root ...
So, how can we embed a linefeed within an echoed character string?
# Embedding a linefeed?
echo "Why doesn't this string \n split on two lines?"
# Doesn't split.
Advanced Bash-Scripting Guide
Chapter 15. Internal Commands and Builtins
182
# Let's try something else.
echo
echo $"A line of text containing
a linefeed."
# Prints as two distinct lines (embedded linefeed).
# But, is the "$" variable prefix really necessary?
echo
echo "This string splits
on two lines."
# No, the "$" is not needed.
echo
echo "---------------"
echo
echo -n $"Another line of text containing
a linefeed."
# Prints as two distinct lines (embedded linefeed).
# Even the -n option fails to suppress the linefeed here.
echo
echo
echo "---------------"
echo
echo
# However, the following doesn't work as expected.
# Why not? Hint: Assignment to a variable.
string1=$"Yet another line of text containing
a linefeed (maybe)."
echo $string1
# Yet another line of text containing a linefeed (maybe).
                                   ^
# Linefeed becomes a space.
# Thanks, Steve Parker, for pointing this out.
This command is a shell builtin, and not the same as /bin/echo, although its
behavior is similar.
bash$ type -a echo
echo is a shell builtin
echo is /bin/echo
printf
The printf, formatted print, command is an enhanced echo. It is a limited variant of the C language
printf() library function, and its syntax is somewhat different.
printf format-string... parameter...
This is the Bash builtin version of the /bin/printf or /usr/bin/printf command. See the
printf manpage (of the system command) for in-depth coverage.
Advanced Bash-Scripting Guide
Chapter 15. Internal Commands and Builtins
183
Older versions of Bash may not support printf.
Example 15-2. printf in action
#!/bin/bash
# printf demo
declare -r PI=3.14159265358979     # Read-only variable, i.e., a constant.
declare -r DecimalConstant=31373
Message1="Greetings,"
Message2="Earthling."
echo
printf "Pi to 2 decimal places = %1.2f" $PI
echo
printf "Pi to 9 decimal places = %1.9f" $PI  # It even rounds off correctly.
printf "\n"                                  # Prints a line feed,
# Equivalent to 'echo' . . .
printf "Constant = \t%d\n" $DecimalConstant  # Inserts tab (\t).
printf "%s %s \n" $Message1 $Message2
echo
# ==========================================#
# Simulation of C function, sprintf().
# Loading a variable with a formatted string.
echo 
Pi12=$(printf "%1.12f" $PI)
echo "Pi to 12 decimal places = $Pi12"      # Roundoff error!
Msg=`printf "%s %s \n" $Message1 $Message2`
echo $Msg; echo $Msg
 As it happens, the 'sprintf' function can now be accessed
#+ as a loadable module to Bash,
#+ but this is not portable.
exit 0
Formatting error messages is a useful application of printf
E_BADDIR=85
var=nonexistent_directory
error()
{
printf "$@" >&2
# Formats positional params passed, and sends them to stderr.
echo
exit $E_BADDIR
}
cd $var || error $"Can't cd to %s." "$var"
Advanced Bash-Scripting Guide
Chapter 15. Internal Commands and Builtins
184
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