basicsys@mars~/lec5>cat G1
#!/bin/bash
for x in $*
 do
  echo "$x"
 done
for x in "$*"
 do
  echo "$x"
 done

basicsys@mars~/lec5>G1 a b c d
a
b
c
d
a b c d

basicsys@mars~/lec5>G1 "a b" "c d" "e f"
a
b
c
d
e
f
a b c d e f

basicsys@mars~/lec5>G1 "a     b" "c     d" "e    f"
a
b
c
d
e
f
a     b c     d e    f

basicsys@mars~/lec5>cat G2
#!/bin/bash
for x in $@
 do
  echo "$x"
 done
for x in "$*"
 do
  echo "$x"
 done

basicsys@mars~/lec5>G2 "a     b"    "c     d"    "e    f"
a
b
c
d
e
f
a     b c     d e    f

basicsys@mars~/lec5>cat G3
#!/bin/bash
for x in $@
 do
  echo "$x"
 done
for x in "$@"
 do
  echo "$x"
 done

basicsys@mars~/lec5>G3 "a     b"    "c     d"    "e    f"
a
b
c
d
e
f
a     b
c     d
e    f

basicsys@mars~/lec5>cat G4
#!/bin/bash
for x in "$@"
 do
  echo "$x"
 done
for x
 do
  echo "$x"
 done

basicsys@mars~/lec5>G4 "a     b"    "c     d"    "e    f"
a     b
c     d
e    f
a     b
c     d
e    f

basicsys@mars~/lec5>cat P1
#!/bin/bash
for x in $*
 do
  echo "$x"
 done
for x in $@
 do
  echo "$x"
 done
for x in "$*"
 do
  echo "$x"
 done
for x in "$@"
 do
  echo "$x"
 done

basicsys@mars~/lec5>P1 "a     b"    "c     d"    "e    f"
a
b
c
d
e
f
a
b
c
d
e
f
a     b c     d e    f
a     b
c     d
e    f

basicsys@mars~/lec5>cat P2
#!/bin/bash
echo $*
echo $#
shift
echo $*
echo $#
shift
echo $*
echo $#

basicsys@mars~/lec5>P2 a b c d
a b c d
4
b c d
3
c d
2

basicsys@mars~/lec5>cat P3
#!/bin/bash
s=0
while [ $# -ge 1 ]
 do
  s=$[$s+$1]
  shift
 done
echo $s

basicsys@mars~/lec5>P3 10 20 30
60

basicsys@mars~/lec5>cat F1
10
20
40

basicsys@mars~/lec5>P3 $(cat F1)
70

basicsys@mars~/lec5>cat F2
10 20 30
10 20

basicsys@mars~/lec5>P3 $(cat F2)
90

basicsys@mars~/lec5>cat P4
#!/bin/bash
if test 5 -ge 5
then
 echo OK
fi

basicsys@mars~/lec5>P4
OK

basicsys@mars~/lec5>cat P5
#!/bin/bash
if [ 5 -ge 5 ]
then
 echo OK
fi

basicsys@mars~/lec5>P5
OK

basicsys@mars~/lec5>cat P6
#!/bin/bash
if [ 5 -gt 5 ]
then
 echo OK
else
 echo not_OK
fi

basicsys@mars~/lec5>P6
not_OK

basicsys@mars~/lec5>cat P7
#!/bin/bash
if [ 5 -gt 5 ]
then
 echo "5 > 5"
 elif [ 5 -eq 5 ]
 then
  echo "5=5"
fi

basicsys@mars~/lec5>P7
5=5

basicsys@mars~/lec5>cat P8
#!/bin/bash
if [ 5 -gt 5 ]
then
 echo "5 > 5"
 elif [ 5 -eq 8 ]
 then
  echo "5=8"
fi

basicsys@mars~/lec5>P8

basicsys@mars~/lec5>cat P9
#!/bin/bash
if [ 5 -gt 5 ]
then
 echo "5 > 5"
 elif [ 5 -eq 8 ]
 then
  echo "5=8"
 else
  echo not_OK
fi

basicsys@mars~/lec5>P9
not_OK

basicsys@mars~/lec5>cat P10
#!/bin/bash
if [ 5 -gt 5 ]
then
 echo "5 > 5"
 elif [ 5 -eq 8 ]
 then
  echo "5=8"
 elif [ 5 -eq 5 ]
 then
  echo "5=5"
fi

basicsys@mars~/lec5>P10
5=5

basicsys@mars~/lec5>cat P11
#!/bin/bash
if [ 5 -gt 5 -o 5 -eq 5 ]
then
 echo "(5 > 5) | (5 = 5)"
fi
if [ 5 -gt 5 -a 5 -eq 5 ]
then
 echo "(5 > 5) & (5 = 5)"
fi

basicsys@mars~/lec5>P11
(5 > 5) | (5 = 5)

basicsys@mars~/lec5>cat P12
#!/bin/bash
if [ a -gt 3 ]
then
 echo "a > 3"
fi

basicsys@mars~/lec5>P12
./P12: line 2: [: a: integer expression expected

basicsys@mars~/lec5>cat P13
#!/bin/bash
if [ a -eq a ]
then
 echo "a = a"
fi

basicsys@mars~/lec5>P13
./P13: line 2: [: a: integer expression expected

basicsys@mars~/lec5>cat P14
#!/bin/bash
if [ -e F1 ]
then
 echo "File/Directory F1 exists"
fi
if [ -f F1 ]
then
 echo "File F1 exists"
fi
if [ -d d1 ]
then
 echo "directory d1 exists"
fi

basicsys@mars~/lec5>P14
File/Directory F1 exists
File F1 exists
directory d1 exists

basicsys@mars~/lec5>cat P15
#!/bin/bash
x=10
y=5
z=8
if [ \( $x -gt $y -o $y -gt $z \) -a \( $x -gt 0 -o $x -le
then
 echo " ( (x > y) | (y > z) ) & (( x > 0 ) | ( x <= 8 ))"
fi

basicsys@mars~/lec5>cat P13.1
#!/bin/bash
if [ a = a ]
then
 echo "a = a"
fi
if [ 01 = 1 ]
then
 echo "01 = 1"
fi
if [ 8 -ne 1 ]
then
 echo "8 not equal 1"
fi
if [ ab != ac ]
then
 echo "ab not equal ac"
fi
if [ ab = ac ]
then
 echo "ab=ac"
fi

basicsys@mars~/lec5>P13.1
a = a
8 not equal 1
ab not equal ac

basicsys@mars~/lec5>cat F1
10
10
10
29
29
ab
ab
ab
ab
10
10

basicsys@mars~/lec5>uniq F1
10
29
ab
10

basicsys@mars~/lec5>uniq -c F1
      3 10
      2 29
      4 ab
      2 10

basicsys@mars~/lec5>uniq -d F1
10
29
ab
10

basicsys@mars~/lec5>sort F1 | uniq -c
      5 10
      2 29
      4 ab

basicsys@mars~/lec5>echo abcd | tr a-z A-Z
ABCD

basicsys@mars~/lec5>echo abcd | tr a-z A-Z
ABCD

basicsys@mars~/lec5>echo abcd | tr abcd 1-4
1234

basicsys@mars~/lec5>echo "a b  c   d" | tr " " "\n"
a
b

c


d

basicsys@mars~/lec5>echo "a b  c   d" | tr -s " " "\n"
a
b
c
d

basicsys@mars~/lec5>echo abcaaccdffa | tr a "\n" | wc -l
5