If "boy" is entered it will never equal 'a' or 'b' and so the expression will always evaluate to false.
Since you are using kshell, the right hand side of an expression in double brackets is treated as a pattern and you can code:
to test if the expansion of $word is a 'b' followed by zero or more characters.
The asterisk (*) must be outside of the quotes or shell will not treat it as a meta character.
If you must, or would rather, use single brackets, then you can code something like this:
Which will take the first character of the value of word and compare it to 'b.' If you try to use pattern characters inside of single brackets the shell will treat them as filename globbing characters and you'll end of with undesired results.
I have a fix_table.ksh script that takes a TABLENAME and a date.
So, in jk_table_file.txt I have the tables...one per line, and
in jk_out_file.txt I have the date in the format I need.
The following doesn not 'want' to work in a shell script...
for TABLE in `cat jk_table_file.txt`; do
... (2 Replies)
For what purposes should we use shell
/what are the tasks we can achieve using shell
which is best book to learn shell programming
and will nayone tell me diff between shell programming aand shell scripting?
Thank u in advance. (1 Reply)
Provides a menu structure that allows a user to select several options - input a name and address,
lookup a name and address, delete a name and address, and print a formatted report from a text
database (note: this requirement assumes that you will use the program to create a database, though in... (1 Reply)
Could someone please tell me what {} mean when they surround a variable?
For instance,
$FILE = 'basename $1' //what is passed into this script
$BANK = 'dirname $1'
$INFILE = ${FILE}.${BANK}.$$
What does $INFILE contain after this assignment?
Please let me know
Thanks
G (4 Replies)
Hi,
Iam new to shell program,
I want to check a file which is having same lines 2 times and i want to display it in a seperate file.
File format is :
AQWERTYU|1234567890
ASDFGHJK|0987654321
ZXCVBNML|1098576453
AQWERTYU|1234567890
I need to take the 1st and 4th lines in the above... (5 Replies)
Hi iam new to shell programming. I would like to ask one dought abt the file
handling in unix.
Iam having a file1 as follows:
ASDERFCX1234567890123456
POIUYTRE0098765432123456
BVCXCVBN0955644411111111
File2
ASDERFCX1234567890123456 kill@abc.com ... (8 Replies)
My purpose was to print out all of name of students in a list.First of all,I created a file name "List" in /home/tuan/Desktop/Shell_programming as below
Tom
Henry
Ben
Linda
Marry
And my script "script" is
#!/bin/sh
path=/home/tuan/Desktop/Shell_programming/List
for student in $path... (3 Replies)
newgrp(1) General Commands Manual newgrp(1)NAME
newgrp - change effective group ID sg - execute command with different group ID
SYNOPSIS
newgrp [-l] [group]
sg group -c command
DESCRIPTION
The newgrp command changes the user's real and effetive group ID by replacing the current shell with a new shell. A new shell is launched
even if an error occours.
A password is requested if the group has a password and the user is not listed in the group file as being a member of that group. The pass-
word can be changed with the gpasswd(1) command.
If the new effective group ID is not in the supplementary group list, newgrp will add the new group ID to the supplementary list, too.
With no operands and options, newgrp changes the user's group IDs (real and effective) back to the group specified in password and group
file.
The sg command works like the newgrp command, except that it executes the given command with /bin/sh and upon exit the group ID of the cur-
rent shell is not changed.
OPTIONS -l, --login
reinitialize the environment as if the user logged in.
--help Print a help list.
-u, --usage
Print a short usage message.
-v, --version
Print program version.
SEE ALSO gpasswd(1), group(5), passwd(1), passwd(5), su(1)AUTHOR
Thorsten Kukuk <kukuk@suse.de>
pwdutils April 2004 newgrp(1)