[Unix / Linux Shell Tutorial - Lession8] Loops

1. #!/bin/bash
2. # Basic while loop
4. counter=1
5. while [ $counter -le 10 ]
6. do
7. echo $counter
8. ((counter++))
9. done
11. echo All done

1. #!/bin/bash
2. # Basic until loop
4. counter=1
5. until [ $counter -gt 10 ]
6. do
7. echo $counter
8. ((counter++))
9. done
11. echo All done

1. #!/bin/bash
2. # Basic for loop
4. names='Stan Kyle Cartman'
6. for name in $names
7. do
8. echo $name
9. done
11. echo All done

1. #!/bin/bash
2. # Basic range in for loop
4. for value in {1..5}
5. do
6. echo $value
7. done
9. echo All done

1. #!/bin/bash
2. # Basic range with steps for loop
4. for value in {10..0..2}
5. do
6. echo $value
7. done
9. echo All done

1. #!/bin/bash
2. # Make a php copy of any html files
4. for value in $1/*.html
5. do
6. cp $value $1/$( basename -s .html $value ).php
7. done

1. #!/bin/bash
2. # Make a backup set of files
4. for value in $1/*
5. do
6. used=$( df $1 | tail -1 | awk '{ print $5 }' | sed 's/%//' )
7. if [ $used -gt 90 ]
8. then
9. echo Low disk space 1>&2
10. break
11. fi
12. cp $value $1/backup/
13. done

1. #!/bin/bash
2. # Make a backup set of files
4. for value in $1/*
5. do
6. if [ ! -r $value ]
7. then
8. echo $value not readable 1>&2
9. continue
10. fi
11. cp $value $1/backup/
12. done

1. #!/bin/bash
2. # A simple menu system
4. names='Kyle Cartman Stan Quit'
6. PS3='Select character: '
8. select name in $names
9. do
10. if [ $name == 'Quit' ]
11. then
12. break
13. fi
14. echo Hello $name
15. done
17. echo Bye