Sponsored Content
Full Discussion: test Null variable
Top Forums Shell Programming and Scripting test Null variable Post 302097445 by kykyboss on Friday 24th of November 2006 11:02:27 AM
Old 11-24-2006
i found it myself thank

if [ -z "$y" ]
 

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

PERL: how to tell if variable is NULL

How to I do a check on a variable to see if it's null-- I am using Perl. (4 Replies)
Discussion started by: dangral
4 Replies

2. Shell Programming and Scripting

How to filter a null variable.

I have the necessity to use this command: cat file1 | grep $A | grep $B where sometime A and, or, B are not set. For example: I set A=@ never defined or set B The above command send a cat error. Any idea? Thanks. Giovanni (1 Reply)
Discussion started by: gio123bg
1 Replies

3. Shell Programming and Scripting

check for NULL variable

Hello I want to check for NULL variable.. but this is not working..please help thanks in advance esham (2 Replies)
Discussion started by: esham
2 Replies

4. Shell Programming and Scripting

how to check null variable

korn shell If then update_smartcare_user_password "$u_id" else echo "Not a database user" fi i get this error Syntax error at line *** : `then' is not expected. what should i do. I want to check whether $a is null or not. (2 Replies)
Discussion started by: sachin.gangadha
2 Replies

5. Shell Programming and Scripting

Question on NULL and zero value of variable

Hi all, I have a stupid question on NULL and zero(0). In a script I've been working with, one of the lines is: if && then The problem I seem to have is when $Current_csm2 is null, this if block is not triggered, and I don't get why because I was under the impression that NULL!=0 Can... (7 Replies)
Discussion started by: spynappels
7 Replies

6. Shell Programming and Scripting

Value of variable is NULL, but test doesn't seem to recognize

Hello, Unix-forums! My problem: read -p "Enter any number, please" number sleep 1 echo $number | tr -d 0-9 test -z $number && echo "Thank you" || echo "This is not a number"Test always displays "This is not a number". It doesn't matter if I entered a or 1. But if I order echo... (2 Replies)
Discussion started by: intelinside
2 Replies

7. Shell Programming and Scripting

Select command with variable options having spaces or null contents

Hi, I'm having an issue trying to produce a hierarchical directory menu that has either any directories listed in a specific directory as options or options with spaces in the option content or null content. So the menu function gets passed a base directory, it then lists any .sh scripts in... (6 Replies)
Discussion started by: andyatit
6 Replies

8. Shell Programming and Scripting

Checking for null condition in a UNIX variable

i have this code for i in `cat sql_output.txt` do -- some script commands done sql_output.txt has 1 column with employee_ids If the sql_output.txt is null then the do loop should not execute. How can i implement this. for i in `cat sql_output.txt` If i is null or empty then ... (5 Replies)
Discussion started by: rafa_fed2
5 Replies

9. Shell Programming and Scripting

If condition to check null variable

Guys, Please help me on the below sample.cfg var=NULL sample.sh #!/bin/sh . /sample.cfg if ;then 1 st command here else 2 nd command here fi (3 Replies)
Discussion started by: AraR87
3 Replies

10. Shell Programming and Scripting

If grep value is null then assign 0 to variable

DELETE=`cat $logfile1 | egrep -i "Delete" | sed 's/ */ /g' | cut -d" " -f2` INSERT=`cat $logfile1 | egrep -i "Insert" | sed 's/ */ /g' | cut -d" " -f2` UPDATE=`cat $logfile1 | egrep -i "Update" | sed 's/ */ /g' | cut -d" " -f2` I need soming like below: if value is null... (8 Replies)
Discussion started by: Veera_V
8 Replies
FASTX_QUALITY_STATS(1)						   User Commands					    FASTX_QUALITY_STATS(1)

NAME
fastx_quality_stats - FASTX Statistics DESCRIPTION
usage: fastx_quality_stats [-h] [-N] [-i INFILE] [-o OUTFILE] Part of FASTX Toolkit 0.0.13.2 by A. Gordon (gordon@cshl.edu) [-h] = This helpful help screen. [-i INFILE] = FASTQ input file. default is STDIN. [-o OUTFILE] = TEXT output file. default is STDOUT. [-N] = New output format (with more information per nucleotide/cycle). The *OLD* output TEXT file will have the following fields (one row per column): column = column number (1 to 36 for a 36-cycles read solexa file) count = number of bases found in this column. min = Lowest quality score value found in this column. max = Highest quality score value found in this column. sum = Sum of quality score values for this column. mean = Mean quality score value for this column. Q1 = 1st quartile quality score. med = Median quality score. Q3 = 3rd quartile quality score. IQR = Inter-Quartile range (Q3-Q1). lW = 'Left-Whisker' value (for boxplotting). rW = 'Right-Whisker' value (for boxplotting). A_Count = Count of 'A' nucleotides found in this column. C_Count = Count of 'C' nucleotides found in this column. G_Count = Count of 'G' nucleotides found in this column. T_Count = Count of 'T' nucleotides found in this column. N_Count = Count of 'N' nucleo- tides found in this column. max-count = max. number of bases (in all cycles) The *NEW* output format: cycle (previously called 'column') = cycle number max-count For each nucleotide in the cycle (ALL/A/C/G/T/N): count = number of bases found in this column. min = Lowest quality score value found in this column. max = Highest quality score value found in this column. sum = Sum of quality score values for this column. mean = Mean quality score value for this column. Q1 = 1st quartile quality score. med = Median quality score. Q3 = 3rd quartile quality score. IQR = Inter-Quartile range (Q3-Q1). lW = 'Left-Whisker' value (for boxplotting). rW = 'Right-Whisker' value (for boxplotting). SEE ALSO
The quality of this automatically generated manpage might be insufficient. It is suggested to visit http://hannonlab.cshl.edu/fastx_toolkit/commandline.html to get a better layout as well as an overview about connected FASTX tools. fastx_quality_stats 0.0.13.2 May 2012 FASTX_QUALITY_STATS(1)
All times are GMT -4. The time now is 04:05 PM.
Unix & Linux Forums Content Copyright 1993-2022. All Rights Reserved.
Privacy Policy