10-30-2018
As always, when starting a thread in the Shell Programming and Scripting forum, it helps to know what operating system and shell you're using.
If /bin/sh on your system is a pure Bourne shell from the 1980's, you might want to use something like expr's : operator to return a string matching everything except a trailing 1.
If /bin/sh on your system is a modern shell supporting the parameter expansions specified by the POSIX standards, using a parameter expansion to remove a trailing 1 would be much simpler, faster, and more efficient than using expr.
Are we supposed to assume that the shell variables CDBTEST, CDBTEST1, messdba, messdba1, sat11cru, sat11cru1. s12tgts, s12tgts1, sa12ss, and sa12ss1 are defined by oraenv?
10 More Discussions You Might Find Interesting
1. UNIX for Dummies Questions & Answers
I have a directory which has 614,000 files.
When attempting to do an ls -ralt in the directory an error too many arguments is shown.
1. I would like to see what files and their stats in the directory
2. I would like to delete certain files of a certain age (3 Replies)
Discussion started by: dinplant
3 Replies
2. UNIX for Dummies Questions & Answers
Hi everyone,
I have a file with multiple entries and I would like to remove the ones that contain either /A"> or /A/, where A can be any letter of the alphabet. Here's an example of the entries:
<Topic r:id="Top/World/Fran">
<catid>476</catid>
<link... (1 Reply)
Discussion started by: BlueberryPickle
1 Replies
3. Shell Programming and Scripting
Hello,
I've created a couple of files within a list using the command "ls -ltr | tail -2 > list" These files are the newest files placed within a directory. From the "list" file, I need to place the filenames as a variable. In which the newest file will be called "new_ctrl" the older file... (4 Replies)
Discussion started by: petersf
4 Replies
4. Shell Programming and Scripting
I am trying to take a list of directories in a folder and give them a variable name. I have this working with the exception that the shell_exec command wants to place a return. Here is my code which might explain better what I am trying to do:
<?php
session_start();
$student1=$_SESSION;... (0 Replies)
Discussion started by: robp2175
0 Replies
5. UNIX for Dummies Questions & Answers
Hello,
I need to run a command for a set of input variables that are present in a tab delimited file, a sample of which is shown below:
1 3749
1 4129
1 5980
2 6201
2 9925
2 6894
3 1338
3 6477
3 6242
3 3632
Every row represents the two input values... (2 Replies)
Discussion started by: Gussifinknottle
2 Replies
6. Shell Programming and Scripting
Hello,
I have this problem.
I have script file, e.g.
#!/usr/bin/ksh
echo $MY_DIR
ls -lt $MY_DIR
I want to list the script but with MY_DIR variable expanded. E.g.
MY_DIR=/abc/xyz (in shell MY_DIR is set)
So I want to list the script and see:
#!/usr/bin/ksh
echo /abc/xyz
ls... (6 Replies)
Discussion started by: r1omen
6 Replies
7. Red Hat
Hey all, I am simply trying to find a listing of all of the default BASH environment variables in RHEL 5.4. Namely, I need to find what the path variable is for libraries since one of my applications doesn't see a module that it needs to run. So far I've seen $LD_PRELOAD, $LD_LIBRARY_PATH and... (4 Replies)
Discussion started by: msarro
4 Replies
8. Shell Programming and Scripting
Hi,
I'm primarily a Cisco/Juniper networking guy, so you'll have to forgive my ignorance when it comes to scripting (although I do write simple backup scripts and things of that nature on a regular basis and I run Linux at home, so I am vaguely familiar with it). What I need to do should be... (2 Replies)
Discussion started by: wolverene13
2 Replies
9. Shell Programming and Scripting
Friends,
I observed a peculiar problem in shell.
if I set a variable using standard input and backspace was used by the user, then the variable get ^? characters embedded in the variable.
###
echo "Enter value for X="
read X
echo $X
expr $X + 1
###
If the variable is echoed, then there... (3 Replies)
Discussion started by: sachinverma
3 Replies
10. UNIX for Beginners Questions & Answers
I have googled this and found many solutions, but none of them are working for me. I am in a korn shell, most others reference bsh, maybe that is the issue? Anyway, all I am trying to do is use a variable I have declared in my main script in a remote shell I am running through ssh.
So I have a... (8 Replies)
Discussion started by: DJR
8 Replies
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
ed(1), 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.
EXPR(1)