07-29-2019
No luck needed. Excerpt from
man bash (Ubuntu linux 19.04):
Quote:
CONDITIONAL EXPRESSIONS
.
.
.
-a file
True if file exists.
-b file
True if file exists and is a block special file.
.
.
.
10 More Discussions You Might Find Interesting
1. Shell Programming and Scripting
Hi there,
I'm very surprised that I can't find this myself and I'm sorry to bother you with such a stupid question. I just want to write a test with one condition or another one. I want either the first argument to be equal to 'this' or the second argument to be equal to 'that'.
~$ cat test
((... (3 Replies)
Discussion started by: chebarbudo
3 Replies
2. Shell Programming and Scripting
I have a shell script, what i want to do is to use the test command and test it, but to be honest with you i really don't know,
can someone give me some advices and how to use it?
I have looked on the internet and saw some commands and scripts but the thing is where to start.....to test... (6 Replies)
Discussion started by: foottuns
6 Replies
3. Shell Programming and Scripting
if -o ]
then
echo "Expected valid value"
The above multiple if condition is NOT working in my script.
I am getting the error as '-a' not expected. Can anyone help with the syntax for this? (5 Replies)
Discussion started by: dinesh1985
5 Replies
4. Shell Programming and Scripting
This is the code:
while test 1 -eq 1
do
read a
$a
if test $a = stop
then
break
fi
done
I read a command on every loop an execute it.
I check if the string equals the word stop to end the loop,but it say that I gave too many arguments to test.
For example echo hello.
Now the... (1 Reply)
Discussion started by: Max89
1 Replies
5. Shell Programming and Scripting
How to check weather a string is like test* or test* ot *test* in if condition (5 Replies)
Discussion started by: johnjerome
5 Replies
6. UNIX for Dummies Questions & Answers
I want to create an IF condition with multiple condition, in the statement below I want to add OR EOF, can any one please advise how to do.
if } != $sample ] && ; then
echo .....
fi
code tags please (1 Reply)
Discussion started by: analyst
1 Replies
7. Shell Programming and Scripting
I have written this script. This is used for creating a backup folder.
#!/bin/sh
#set -x
. /home/.profile
usage="Usage is $0"
usage="$usage "
# Use the getopt utility to set up the command line flags.
set -- `/usr/bin/getopt b: $*`
# Process individual command line arguments
while ;... (1 Reply)
Discussion started by: arijitsaha
1 Replies
8. Shell Programming and Scripting
Hi, guys.
In Linux Shell script, how can I check a string whether meets some conditions.
e.g.:
If a string str must start with a underscore or a alphabet, and it must contains at least one lowercase, one uppercase, one numeric and one punctuation, and its length must be more than 8 characters... (2 Replies)
Discussion started by: franksunnn
2 Replies
9. UNIX for Dummies Questions & Answers
Hi Guys,
I am new to shell script.I need your help to write a shell script.
I need to write a shell script to extract data from a .csv file where columns are ',' separated.
The file has 5 columns having values say column 1,column 2.....column 5 as below along with their valuesm.... (1 Reply)
Discussion started by: Vivekit82
1 Replies
10. Shell Programming and Scripting
Hi All,
I am trying to place one SQL query in Shell Script with Where Condition as Status='1' But after running the the script it is returning error as
SQL0206N "1" is not valid in the context where it is used. SQLSTATE=42703
The query is working fine in Data Base.
Please suggest... (1 Reply)
Discussion started by: sumanmca2006
1 Replies
test(1sh5) test(1sh5)
Name
test - condition evaluation command
Syntax
test expr
[ expr ]
Description
The command evaluates the expression expr. If the value of expr is true, the command returns a zero exit status; otherwise, it returns a
nonzero exit status. The command also returns a nonzero exit status if no arguments are specified. The following primitives are used to
construct expr:
-r file True if file exists and is readable.
-w file True if file exists and is writable.
-x file True if file exists and is executable.
-f file True if file exists and is a regular file.
-d file True if file exists and is a directory.
-c file True if file exists and is a character special file.
-b file True if file exists and is a block special file.
-p file True if file exists and is a named pipe (fifo).
-u file True if file exists and its set-user-ID bit is set.
-g file True if file exists and its set-group-ID bit is set.
-k file True if file exists and its sticky bit is set.
-s file True if file exists and has a size greater than zero.
-t [ fildes ] True if the open file whose file descriptor number is fildes (1 by default) is associated with a terminal device.
-z s1 True if the length of string s1 is zero.
-n s1 True if the length of the string s1 is non-zero.
s1 = s2 True if strings s1 and s2 are identical.
s1 != s2 True if strings s1 and s2 are not identical.
s1 True if s1 is not the null string.
n1 -eq n2 True if the integers n1 and n2 are algebraically equal. Any of the comparisons -ne, -gt, -ge, -lt, and -le may be used in
place of -eq.
These primitives can be combined with the following operators:
! unary negation operator.
-a binary and operator.
-o binary or operator (-a has higher precedence than -o).
( expr ) parentheses for grouping.
Note that all the operators and flags are separate arguments to the command. Note also that parentheses are meaningful to the Shell and
must be escaped. In the form of the command that uses square brackets ([]), instead of the word test, the brackets must be delimited by
blanks.
See Also
find(1), sh5(1), test(1)
test(1sh5)