I need to check if $1 or $2 are empty before continuing but I don't know if bash has any logic of the sort. This is what I'm looking for - except that "and" doesn't seem to work.
if and ;then
...
Thank you! :D (4 Replies)
How to check the variable is empty or not?
aaa=" "
how to check aaa variable is empty or just spacing?
If only spacing inside.. it will asume it is empty.
some are 6 spacing, or 8 spacing.. as long as variable is empty with spacing..
anyone can help me? (2 Replies)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
1.pls tell me the command for checking whether a given directory is empty or not .
2. can i check what is the... (1 Reply)
Hi All,
I have file with only one record,always be only one record. as like below.
if that line contains newline end of the line..no need to add, if not just add the new line character.
END OF FILE. ROW COUNT: 7
Please help me..
Thanks, (9 Replies)
I am reading from a file and executing the jobs with/without parameters as the job requires.
File
job1 R
job2
job3 Y 123
if
then
<job>.ksh
else
<job>.ksh $params
fi
This works fine if the line read from the file has parameters
it executes like job1.ksh R
But for... (2 Replies)
hi,
i want to check whether a a variable contains some value or is empty in a shell script. so if the variable contains some value i want to do some job and if the variable doesnt contain any value then i need to skip that job.
here is a sample script
read_filenames.sh contains
... (5 Replies)
Hello
So i have that script collection, in which i have a single script to create a configuration file.
In there, i have multiple occourences of something like this:
prj_title=$(tui-read "What is the TITLE? ($prj_name):")
] && prj_title="${prj_name/_/ }"
They all work as expected, if... (5 Replies)
Hi,
I am simply trying to check if the variable is empty in the code below but it isn;t working. Anything that I might have missed here
#Check if values in job card are not empty
title=`cat $filename | grep "TITLE:" | cut -d ":" -f3`
if ]
then
echo "10:Title Empty" ":Fail">> $rptfile... (13 Replies)
Given a csv file with 40 columns with name, address, hometown etc.
I use a bash command in 1 line which:
1. gets the address column and pipes that to
2. grep the first digit and everything that follows
Command:
awk -F ";" '{print $19}' /Users/jb/Desktop/ReorderTempTotal.csv | grep -o "\d.*"... (7 Replies)
Discussion started by: JBVeenstra
7 Replies
LEARN ABOUT HPUX
getopt
getopt(1) General Commands Manual getopt(1)NAME
getopt - parse command options
SYNOPSIS
optstring args
DESCRIPTION
is used to break up options in command lines for easy parsing by shell procedures and to check for legal options. optstring is a string of
recognized option letters (see getopt(3C)). If a letter is followed by a colon, the option is expected to have an argument, which may or
may not be separated from it by whitespace.
The positional parameters ...) of the shell are reset so that each option is preceded by a and is in its own positional parameter; each
option argument is also parsed into its own positional parameter.
recognizes two hyphens to delimit the end of the options. If absent, places at the end of the options.
The most common use of is in the shell's command (see the example below) where converts the command line to a more easily parsed form.
writes the modified command line to the standard output.
EXTERNAL INFLUENCES
Environment Variables
determines the language in which messages are displayed.
If is not specified in the environment or is set to the empty string, the value of is used as a default for each unspecified or empty vari-
able.
If is not specified or is set to the empty string, a default of "C" (see lang(5)) is used instead of If any internationalization variable
contains an invalid setting, behaves as if all internationalization variables are set to "C". See environ(5).
International Code Set Support
Single-byte and multibyte character code sets are supported.
DIAGNOSTICS
prints an error message on the standard error when it encounters an option letter that is not included in optstring.
EXAMPLES
The following code fragment processes the arguments for a command that can take the options or and the option which requires an argument:
This code accepts any of the following as equivalent:
WARNINGS
option arguments must not be null strings nor contain embedded blanks.
SEE ALSO getopts(1), sh(1), getopt(3C).
getopt(1)