ksh test for null

null is the case when your action failed, not when return empty reply also,...

null is the case when your action failed, not when return empty reply also, grep -q could be tested Use the test -n option, or the ksh / bash [[.

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So [ -z "$1" ] is a proper way of testing if $1 is empty, and [ &...

So [ -z "$1" ] is a proper way of testing if $1 is empty, and [ "$x" = "$y" ] is a This method works for the traditional bourne shell, as well as ksh.

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One way to test for (non-)empty string is to use test and -z (-n) Your shel...

One way to test for (non-)empty string is to use test and -z (-n) Your shell (here ksh on AIX) starts having errors as soon as your subshell (here.

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hi all, i have a shell (ksh) script where i am reading line by line from a ...

hi all, i have a shell (ksh) script where i am reading line by line from a to check if the grep command actually returned something or was null. i  Check for empty string.

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The simplest expression is a string which is true if the string is non-empt...

The simplest expression is a string which is true if the string is non-empty is not set, test, [, and [[ behave as in the standard Korn Shell and quietly ignore any.

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Check if parameter is NULL (shell scripting) Programming I'd like it t...

Check if parameter is NULL (shell scripting) Programming I'd like it to work under ksh, but if it can only be done under bash then fine!:).

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KSH - Korn Shell Tutorial. Matching Patterns; Conditional Statements; Test ...

KSH - Korn Shell Tutorial. Matching Patterns; Conditional Statements; Test Objects (Files, Directories, etc.) Format of flow control functions; Positional Parameter.

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This guide explains how to determine if a bash variable is empty or Bash Sh...

This guide explains how to determine if a bash variable is empty or Bash Shell: Find Out If a Variable Is Set or Not; bash(1); test(1); help [; help [[ Many-a-times, AIX installations do not have bash/ksh/whatever by default.

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This syntax is compatible with ksh (at least ksh93, anyway). You can test t...

This syntax is compatible with ksh (at least ksh93, anyway). You can test to see if a variable is specifically unset (as distinct from an empty.

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Try using the -z test: if [ -z "$1" ] && [ -z "$2&qu...

Try using the -z test: if [ -z "$1" ] && [ -z "$2" ]. From man bash: z string True if the length of string is zero.

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In Bash you quite often need to check to see if a variable has been set or ...

In Bash you quite often need to check to see if a variable has been set or has a value other than an empty string. This can be done using the -n.

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Being able to test if a variable is a number in the Korn shell is very usef...

Being able to test if a variable is a number in the Korn shell is very useful but not immediately obvious #Notes: expr $1 + 0 >/dev/null 2>&1.

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This works on my AIX systems but not my HP-UX #!/bin/ksh while read TBS do ...

This works on my AIX systems but not my HP-UX #!/bin/ksh while read TBS do if! [ $TBS ] then echo No Tablespace to process continue else.

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The test command evaluates the Expression parameter, and if the expression ...

The test command evaluates the Expression parameter, and if the expression value String1, Returns a True exit value if the String1 variable is not a null string.

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test is a command-line utility found in Unix-like operating systems that ev...

test is a command-line utility found in Unix-like operating systems that evaluates conditional Non standard Korn Shell extensions: If the quotation marks are omitted and $1 is the empty string, the test command displays the error message.

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