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Shell Programming and Scripting

Case statement - continue

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# 8  
Old 03-08-2017
Hi,

Here's a code example combining case, for and if:

Code:
$ cat script.sh
#!/bin/bash

for animal in `/bin/ls animals`
do
        case "$animal" in
                "cat")
                        echo "This is an acceptable animal: $animal"
                        ;;
                "dog")
                        echo "This is another cceptable animal: $animal"
                        ;;
                *)
                        if [ "$animal" == "furby" ]
                        then
                                #Let's skip this - it's not a real animal
                                continue
                        else
                                echo "And this is also an acceptable animal: $animal"
                        fi
                        ;;
        esac
done
$ ls animals
cat  dog  furby  monkey  zebra
$ ./script.sh
This is an acceptable animal: cat
This is another cceptable animal: dog
And this is also an acceptable animal: monkey
And this is also an acceptable animal: zebra
$

When we run the script, the effect of the continue statement when animal is equal to "furby" is to skip at that point entirely to the next anmal in the list, which is "monkey". So we only see "cat", "dog", "monkey" and "zebra" mentioned in the output, with the continue causing "furby" to be skipped in the output entirely.

Hope this helps clear up how these things can be used in combination.
# 9  
Old 03-08-2017
Quote:
Originally Posted by digioleg54
No, it show me an error
Code:
./sftp_ondemand.sh[95]: syntax error at line 324 : `else' unexpected

We have no idea what 'else' that is, where it is, or why you put it there.

This is because we can't see your computer from here. Show your code.
# 10  
Old 03-08-2017
Hi,

To also show how continue can be used with case alone, here's a slightly modified version without the if clause.

Code:
#!/bin/bash

for animal in `/bin/ls animals`
do
        case "$animal" in
                "cat")
                        echo "This is an acceptable animal: $animal"
                        ;;
                "dog")
                        echo "This is another cceptable animal: $animal"
                        ;;
                "furby")
                        #Let's skip this - it's not a real animal
                        continue
                        ;;
                *)
                        echo "And this is also an acceptable animal: $animal"
                        ;;
        esac
done

# 11  
Old 03-08-2017
Sorry all, but I am working on AIX and Bourne shell
# 12  
Old 03-08-2017
The *) does the trick. Because it is last and matches everything that was not matched before, it behaves like an else.
Code:
cd dir &&
for file in *
do
  case $file in
  a)
        do something
  ;;
  b)
        do something
  ;;
  *)
       do something else
  ;;
  esac
done

# 13  
Old 03-08-2017
Quote:
Originally Posted by digioleg54
Sorry all, but I am working on AIX and Bourne shell
So change #!/bin/bash to #!/bin/sh. Nothing about that code was bash specific.
# 14  
Old 03-09-2017
Another thing to note is that on AIX /bin/sh is a POSIX shell, not a Bourne shell (it is hard linked to psh and ksh).

The Bourne shell is bsh, but it is only there for legacy reasons, and you probably do not want to use that..
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