"var" is going to start with arg1 and get reassigned to the next in the list each iteration until argn
"T1" is always going to be arg1
"T2" is always going to be arg2
How can I use a variable that has the conditions for the if statement stored in it?
my test script
condition=" || || "
if "$condition"
then echo "true"
else echo "false"
fi
output
$ ./test2.sh
./test2.sh: line 3: || || : command not found
false (2 Replies)
Hi All,
I am trying to check if two variables have value assigned to it.
i am doing it like
if ]
then
echo "Please specify either single hostname or host file for the report"
usage
exit
fi
But its not working for it.Even i specify values for both variables it dont go... (6 Replies)
Hi, I have meaning to include an if condition statement in my code to check the directory for existing output files and if its existing i want the program to delete it before doing the succeeding command. i just dont know the correct syntax for it. thanks much guys, this forum has indeed been very... (4 Replies)
Urgent help with bash scripting
1- i am using grep to find a string called: tinker panic 0 in a file /etc/ntp.conf
if the string is not there, i want to add the strings in /etc/ntp.conf file in the first line of the file. if not do nothing or exit.
2- also i want to add # in front of the... (2 Replies)
I want to check (using bash condition test function) if string contains three spaces, ignoring last three spaces at the end of string.
string_to_report='foo bar foo bar '
string_to_ignore='foo bar ' (8 Replies)
In the below I can not seem to add a line that will add Not low if the statement in bold is not true or meet. I guess when the first if statement is true/meet then print low, otherwise print Not low in $(NF + 1). I am not sure how to correctly add this. Thank you :).
if(low <= $2 && $2 <=... (5 Replies)
Hi,
I need to perform the untar and rm operation if the file found is a .tar and does not have test.tar or hello.tar as the file names.
Below is the loop to check the same.
for tf in *.tar
do if ]
then found=1
... (1 Reply)
I wrote a code to find codons in a DNA string. The only problem I have is how do I make the code only work for a file with DNA. This means the file only has the characters a,c,g,t and no white space characters. (3 Replies)
Hi.
I wrote this small bash script, i want to compare second column from file1 with file2 if a pattern matches. Files are small and I am sure that pattern occurs only once. I think this can be rewritten into a awk one liner. Appreciate if someone could give me idea. Whole NR FNR confuse me :o
... (6 Replies)
Discussion started by: ctrld
6 Replies
LEARN ABOUT PLAN9
rewrite
REWRITE(6) Games Manual REWRITE(6)NAME
rewrite - mail rewrite rules
SYNOPSIS
/mail/lib/rewrite
DESCRIPTION Mail(1) uses rewrite rules to convert mail destinations into commands used to dispose of the mail. Each line of the file is a rule. Blank
lines and lines beginning with # are ignored.
Each rewriting rule consists of (up to) 4 strings:
pattern
A regular expression in the style of regexp(6). The pattern is applied to mail destination addresses. The pattern match is case-
insensitive and must match the entire address.
type The type of rule; see below.
arg1 An ed(1) style replacement string, with
standing for the text matched by the nth parenthesized subpattern.
arg2 Another ed(1) style replacement string.
In each of these fields the substring s is replaced by the login id of the sender and the substring l is replaced by the name of the
local machine.
When delivering a message, mail starts with the first rule and continues down the list until a pattern matches the destination address. It
then performs one of the following actions depending on the type of the rule:
>> Append the mail to the file indicated by expanding arg1, provided that file appears to be a valid mailbox.
| Pipe the mail through the command formed from concatenating the expanded arg1 and arg2.
alias Replace the address by the address(es) specified by expanding arg1 and recur.
translate
Replace the address by the address(es) output by the command formed by expanding arg1 and recur.
Mail expands the addresses recursively until each address has matched a >> or | rule or until the recursion depth indicates a rewriting
loop (currently 32).
If mail(1) is called with more than one address and several addresses match | rules and result in the same expanded arg1, the message is
delivered to all those addresses by a single command, composed by concatenating the common expanded arg1 and each expanded arg2. This mail
bundling is performed to reduce the number of times the same message is transmitted across a network. For example, with the following re-
write rule
([^!]*.att.com)!(.*) | "/mail/lib/qmail 's' 'net!1'" "'2'"
if user presotto runs the command
% mail research.att.com!ken research.att.com!rob
there will follow only one execution of the command
/mail/lib/qmail presotto net!research.att.com ken rob
Here /mail/lib/qmail is an rc(1) script used for locally queuing remote mail.
In the event of an error, the disposition of the mail depends on the name of the command executing the rewrite. If the command is called
mail and is run by $user, the command will print an error and deposit the message in /mail/box/$user/dead.letter. If the command is called
rmail, usually because it was invoked to deliver mail arriving over the network, the message will be returned to the sender. The returned
message will appear to have been sent by user postmaster.
SEE ALSO mail(1)REWRITE(6)