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usage : -z <string_name>

meaning: <string_name> is NULL and does exist

it is used in if,while ,....

Hi,

Could you please tell what is the meaning of -z in while loop condition.
For example,

while [ -z "$name" ]; do
echo "*** Enter the age "
readage

hi all,

i need c++ code to print a binary or non binary tree using stl map....
please help me to find the same..........

hi all,

i need a c++ function which converts a linear list to circular.
presently i am working with two files. i.e., one linear list file. and one circular list file to do some operations. i...

hi thanks for the reply. but i have a question that is this pseudo code is the optimal solution to detect the circular list?

could you please give me a sample code

hi all
i have a tree structure:
root --- node 1 to node 10
in each node --- sub node 1 to sub node 10
in each sub node --- leaf node 1 to leaf node 10

i have to print this in following...

hi all,

i need c++ code to check whether a list is circular or not...
please help

hi all,
i have a table with employee details like his name,addr,DOB etc.
i need a shell program which takes one date as input from user and print the employees whose DOB is less than that date.
in...

hello
could you please explain this command?

awk '(NR%4==1 || NR%4==0) && $0'

thanks a lot. before i use to do like this

$vi f1.sh
paste -d'\n' nice | while read line2;
do
echo "$line2"
read line2
done

$vi f2.sh

paste -d'\n' nice ...

hi,
i have 2 files.
file1:
1
2
3
4
5
6

file2:
a
b
c
d
e
f
g
h
i