Right, personal experience showed me that the use of [[ condition ]] is the most compatible one among shells.
But then again i only use sh and bash on diffrent linux'...
When I log in from my linux workstation (CentOS4) to a solaris 8 server using SSH or telnet, the terminal settings don't seem to work well. When I tail or vi a file, I get a blank screen or no response, and I am no longer able to interact with the session. I have to type the escape sequence to... (2 Replies)
Hi all,
I would like to know how to have a color display in the terminal...
In the sense that,
In many linux terminals,we have color coded for each file type,
green for executable ,blue for dirs and so on...
I wanted to know how i can have the same arrangement in solaris(b-79a)
I am not... (5 Replies)
Hi,
I keep on getting the following error on my linux terminal. It did not harm my system so far, but I was wondering if this can be eliminated.
{
Gecko:4617): GLib-GObject-CRITICAL **: file gobject.c: line 1337 (g_object_unref): assertion `G_IS_OBJECT (object)' failed
(Gecko:4617):... (2 Replies)
Hello all
is there any free tool like linux tabbed terminal but for windows
im used to work with putty and its great but i wander if there something like putty
but with tabs
thanks (12 Replies)
hi im new to this and i just want to learn about linux and i just wanted to know how would i be able to perform a system check to see if a directory exists.
can any one help me? (2 Replies)
Hello!
I need to create a file and provide access to two users of the file under the same command in linuxs terminal window.
The question is how can I do it? (3 Replies)
Hello everyone, I have an interesting project I'd like to implement on a Linux server here at work. Essentially, I'd like to replace a handful of Windows servers with a single Linux server. The only task these Windows servers perform, is provide remote desktops via RDP protocol that people... (13 Replies)
Hi,
How can we get the process id of the terminal we are using?
When we logged in to unix, we have an associated terminal. we can use "tty" command to get the terminal we are using like:
/dev/pts/0
I want to know the process id of this terminal. Please reply as I searched a lot but I... (8 Replies)
Discussion started by: crazybisu
8 Replies
LEARN ABOUT BSD
expr
EXPR(1) General Commands Manual EXPR(1)NAME
expr - evaluate arguments as an expression
SYNOPSIS
expr arg ...
DESCRIPTION
The arguments are taken as an expression. After evaluation, the result is written on the standard output. Each token of the expression is
a separate argument.
The operators and keywords are listed below. The list is in order of increasing precedence, with equal precedence operators grouped.
expr | expr
yields the first expr if it is neither null nor `0', otherwise yields the second expr.
expr & expr
yields the first expr if neither expr is null or `0', otherwise yields `0'.
expr relop expr
where relop is one of < <= = != >= >, yields `1' if the indicated comparison is true, `0' if false. The comparison is numeric if
both expr are integers, otherwise lexicographic.
expr + expr
expr - expr
addition or subtraction of the arguments.
expr * expr
expr / expr
expr % expr
multiplication, division, or remainder of the arguments.
expr : expr
The matching operator compares the string first argument with the regular expression second argument; regular expression syntax is
the same as that of ed(1). The (...) pattern symbols can be used to select a portion of the first argument. Otherwise, the
matching operator yields the number of characters matched (`0' on failure).
( expr )
parentheses for grouping.
Examples:
To add 1 to the Shell variable a:
a=`expr $a + 1`
To find the filename part (least significant part) of the pathname stored in variable a, which may or may not contain `/':
expr $a : '.*/(.*)' '|' $a
Note the quoted Shell metacharacters.
SEE ALSO sh(1), test(1)DIAGNOSTICS
Expr returns the following exit codes:
0 if the expression is neither null nor `0',
1 if the expression is null or `0',
2 for invalid expressions.
7th Edition April 29, 1985 EXPR(1)