basicsys@mars~/lec9>cat A3
#!/bin/bash
x=8
function f1 {
  echo "inside f1 x=$x"
  x=9
  y=10
}
echo "outside before calling f1 x=$x y=$y"
f1
echo "outside after calling f1 x=$x y=$y"

basicsys@mars~/lec9>A3
outside before calling f1 x=8 y=
inside f1 x=8
outside after calling f1 x=9 y=10

basicsys@mars~/lec9>cat A4
#!/bin/bash
x=8
function f1 {
  echo "inside f1 x=$x"
  local x
  local y=10
  echo "inside f1 after local statement x=$x y
  x=9
}
echo "outside before calling f1 x=$x y=$y"
f1
echo "outside after calling f1 x=$x y=$y"

basicsys@mars~/lec9>A4
outside before calling f1 x=8 y=
inside f1 x=8
inside f1 after local statement x= y=10
outside after calling f1 x=8 y=

basicsys@mars~/lec9>cat P1
#!/bin/bash
echo $1
f1() {
  echo $1
  for x in "$@"
   do
    echo "$x"
   done
}
f1
f1 "20 30" 40
echo $1

basicsys@mars~/lec9>P1 400 5
400

20 30
20 30
40
400

basicsys@mars~/lec9>cat P1
#!/bin/bash
f1() {
  echo $[$1**2 + $2**2]
  y=$[$1**2 + $2**2]
}
f1 2 3
echo y=$y
x=$(f1 3 4)
echo x=$x
echo y=$y
echo "$(f1 6 7)"
echo y=$y
f1 8 9
echo y=$y

basicsys@mars~/lec9>P1
13
y=13
x=25
y=13
85
y=13
145
y=145

basicsys@mars~/lec9>cat P2
#!/bin/bash
f1() {
 echo I am f1 in P2
}
f1

basicsys@mars~/lec9>cat f1
#!/bin/bash
echo "I am file f1"

basicsys@mars~/lec9>P21
I am f1 in P2
I am file f1
I am f1 in P2

basicsys@mars~/lec9>cat B1
#!/bin/bash
get_file_name(){
 echo $1 | tr "/" "\n" | tail -1
}
get_file_name a/b/c
#find $1 -type f -exec get_file_name {} \;
basicsys@mars~/lec9>chmod u+x B1

basicsys@mars~/lec9>B1
c

basicsys@mars~/lec9>cat B1
#!/bin/bash
get_file_name(){
 echo $1 | tr "/" "\n" | tail -1
}
get_file_name a/b/c
find $1 -type f -exec get_file_name {} \;
basicsys@mars~/lec9>B1 .
c
find: get_file_name: No such file or directory
find: get_file_name: No such file or directory
find: get_file_name: No such file or directory

basicsys@mars~/lec9>cat B1
#!/bin/bash
get_file_name(){
 echo $1 | tr "/" "\n" | tail -1
}
get_file_name a/b/c
export -f get_file_name
find $1 -type f -exec bash -c "get_file_name {}" \;
basicsys@mars~/lec9>B1 .
c
f2
A3

basicsys@mars~/lec9>cat C1
#!/bin/bash
echo -n >| FF
for i in $(seq 10)
 do
  echo F$i >> FF
 done

basicsys@mars~/lec9>cat FF
F1
F2
F3
F4
F5
F6
F7
F8
F9
F10

basicsys@mars~/lec9>cat F[0-9]*
I am file F1
I am file F10
I am file F2
I am file F3
I am file F4
I am file F5
I am file F6
I am file F7
I am file F8
I am file F9

basicsys@mars~/lec9>ls F[0-9]*
F1  F10  F2  F3  F4  F5  F6  F7  F8  F9

basicsys@mars~/lec9>ls F[0-9]* | xargs cat
I am file F1
I am file F10
I am file F2
I am file F3
I am file F4
I am file F5
I am file F6
I am file F7
I am file F8
I am file F9

basicsys@mars~/lec9>xargs cat
F1 F5
F7 F8 F2
I am file F1
I am file F5
I am file F7
I am file F8
I am file F2

basicsys@mars~/lec9>xargs echo
abc
def ghe
abc def ghe

basicsys@mars~/lec9>xargs echo -n
abc
def

abc defbasicsys@mars~/lec9>

basicsys@mars~/lec9>echo 1 2 3 4 5 6 7 8 9 |xargs -n 3 echo
1 2 3
4 5 6
7 8 9

basicsys@mars~/lec9>echo 1 2 3 4 5 6 7 8 9 10| xargs -n 3 echo
1 2 3
4 5 6
7 8 9
10

basicsys@mars~/lec9>cat G2
#!/bin/bash
echo "using axargs"
date
find ~/win12 -type f | xargs egrep -l abc >|/dev/null
date
echo "using -exec "
date
find ~/win12 -type f -exec egrep -l abc {} \; >|/dev/null
date

basicsys@mars~/lec9>G2
using axargs
Fri Jan  6 13:20:03 IST 2012
Fri Jan  6 13:20:03 IST 2012
using -exec
Fri Jan  6 13:20:03 IST 2012
Fri Jan  6 13:20:26 IST 2012

basicsys@mars~/lec9>x=abcde
basicsys@mars~/lec9>echo $x
abcde

basicsys@mars~/lec9>echo ${x}
abcde

basicsys@mars~/lec9>xx=5

basicsys@mars~/lec9>echo ${x}x
abcdex

basicsys@mars~/lec9>echo ${xx}
5

basicsys@mars~/lec9>echo $xx
5

basicsys@mars~/lec9>x=abcdef

basicsys@mars~/lec9>echo ${#x}
6

basicsys@mars~/lec9>expr length $x
6

basicsys@mars~/lec9>echo -n $x | wc -c
6

basicsys@mars~/lec9>echo ${#abcdef}
0

basicsys@mars~/lec9>expr match abcdef ab.[cd]
4

basicsys@mars~/lec9>expr match abcdef a*.[cd]

3

basicsys@mars~/lec9>expr match abcdef '\('a*.[cd]'\)'
abc