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Full Discussion: What is the purpose of "-z" string checking?
Top Forums Shell Programming and Scripting What is the purpose of "-z" string checking? Post 302852797 by Corona688 on Thursday 12th of September 2013 12:21:36 PM
Old 09-12-2013
On many systems you'll have the much safer pgrep to check for the existence of a program, too.

Code:
if pgrep java >/dev/null
then
        echo "java is there"
else
        echo "java is not there"
fi

 

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LEARN ABOUT DEBIAN

git-check-attr

GIT-CHECK-ATTR(1)						    Git Manual							 GIT-CHECK-ATTR(1)

NAME

       git-check-attr - Display gitattributes information

SYNOPSIS

       git check-attr [-a | --all | attr...] [--] pathname...
       git check-attr --stdin [-z] [-a | --all | attr...] < <list-of-paths>

DESCRIPTION

       For every pathname, this command will list if each attribute is unspecified, set, or unset as a gitattribute on that pathname.

OPTIONS

       -a, --all
	   List all attributes that are associated with the specified paths. If this option is used, then unspecified attributes will not be
	   included in the output.

       --cached
	   Consider .gitattributes in the index only, ignoring the working tree.

       --stdin
	   Read file names from stdin instead of from the command-line.

       -z
	   Only meaningful with --stdin; paths are separated with a NUL character instead of a linefeed character.

       --
	   Interpret all preceding arguments as attributes and all following arguments as path names.

       If none of --stdin, --all, or -- is used, the first argument will be treated as an attribute and the rest of the arguments as pathnames.

OUTPUT

       The output is of the form: <path> COLON SP <attribute> COLON SP <info> LF

       <path> is the path of a file being queried, <attribute> is an attribute being queried and <info> can be either:

       unspecified
	   when the attribute is not defined for the path.

       unset
	   when the attribute is defined as false.

       set
	   when the attribute is defined as true.

       <value>
	   when a value has been assigned to the attribute.

EXAMPLES

       In the examples, the following .gitattributes file is used:

	   *.java diff=java -crlf myAttr
	   NoMyAttr.java !myAttr
	   README caveat=unspecified

       o   Listing a single attribute:

	   $ git check-attr diff org/example/MyClass.java
	   org/example/MyClass.java: diff: java

       o   Listing multiple attributes for a file:

	   $ git check-attr crlf diff myAttr -- org/example/MyClass.java
	   org/example/MyClass.java: crlf: unset
	   org/example/MyClass.java: diff: java
	   org/example/MyClass.java: myAttr: set

       o   Listing all attributes for a file:

	   $ git check-attr --all -- org/example/MyClass.java
	   org/example/MyClass.java: diff: java
	   org/example/MyClass.java: myAttr: set

       o   Listing an attribute for multiple files:

	   $ git check-attr myAttr -- org/example/MyClass.java org/example/NoMyAttr.java
	   org/example/MyClass.java: myAttr: set
	   org/example/NoMyAttr.java: myAttr: unspecified

       o   Not all values are equally unambiguous:

	   $ git check-attr caveat README
	   README: caveat: unspecified

SEE ALSO

       gitattributes(5).

GIT

       Part of the git(1) suite

Git 1.7.10.4							    11/24/2012							 GIT-CHECK-ATTR(1)
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