Was wondering if someone could interpret this for me -- I'm not sure what everything means. It's a shell script from my bash book:
what I don't quite understand is the "$@". I think, if I understand it correctly, it is all the positional parameters to the function, as separate double quoted strings separated by spaces.
The function works fine, but how does it interpret a directory with more than one word? Is each word in the directory name one positional parameter or is the whole directory name one positional parameter?
Curiously, if I change "$@" to "$*" the function works as well, so what's the difference as far as the program is concerned? I know that "$*" is all the positional parameters, taken as one string.
Last edited by Scott; 05-06-2010 at 08:20 PM..
Reason: Code tags please...
Hi guys,
I have no idea on unix but suddenly, my cobol programs calls a unix script that i know nothing about.
can you guys interpret these lines for me?
i know its a print command but I want to actually know how many copies it prints.
qprt -da -P $1 -t '6' -i '6' -l '70' $2
qprt -da... (1 Reply)
Could you interpret the following sed and awk command for me?
command:
cat tempfile2 |sed "s/\(BUILD-3-.*-\.-\)\(.*\..*\..*\)/\2/" | awk '{printf "%-8.8s %-23.23s %-30.30s %-50.50s\n", $1,$2,$3,substr($0,index($0,$4))}' > outfile2 2>/dev/null
input:(data in tempfile2)... (1 Reply)
Hi,
So I am new to Unix, and I need to check the performance of some apps I am running. But I don't know how to interpret the output from TOP.
Could somebody please explain the difference between the different values. And also explain how I can have a process which has a %CPU > 100?
... (7 Replies)
hi
I have a text file abc.txt as below
a = 0
b = 1
c = 3
i want to interpret this file i.e. if number corresponding to 'a' is 0 i want to run a script script.bash .
How do do that? (4 Replies)
I have collected data of Number of L2 cache misses using PAPI. I had run an MPI application with 4 threads (mpirun -np 4) and each thread reads the cache misses in L2. Each thread outputs data for every timestamp. eg:
Timestamp data
xxx530 thread# 0 2136
xxx531 thread# 0 ... (0 Replies)
I know $0 is the entire file's contents (at least I think that is what it is!), but what exactly is: $0!~
This was a snippet from a larger line
awk '$0!~/^$/ {print $0}'
This deletes blank lines, but I want to know specifically the $0!~ part... I am guessing /^$/ is regex for blank line...... (5 Replies)
Can anyone tell me how to interpret this:
listpage="ls |more" (the spaces are there in the example)
$listpage
It's from my bash book and I'm not sure what it means (3 Replies)
hi All,
i have never used sed in Unix environment, but i have one script which is using this following command:
cat audit_session_rpt_MSP_20140331.lst|sed -n '/Apr 14/!p'| sed -n '/Page/!p'| sed -n '/UserName/!p' |\
egrep -v '^-|^=|^\*'|sed '/^$/d'|sed -e '1,7d'... (1 Reply)
I booted into single user mode with
/usr/sbin/reboot -- -s
but after doing a control -d
my
who -r
shows
run-level 3 Nov 17 14:07 3 0 S
I was expecting it to show run-level S
why is this still in run level 3?
thanks (1 Reply)
Discussion started by: goya
1 Replies
LEARN ABOUT OPENSOLARIS
shift
shift(1) User Commands shift(1)NAME
shift - shell built-in function to traverse either a shell's argument list or a list of field-separated words
SYNOPSIS
sh
shift [n]
csh
shift [variable]
ksh
*shift [n]
ksh
+shift [n]
DESCRIPTION
sh
The positional parameters from $n+1 ... are renamed $1 ... . If n is not specified, it is assumed to be 1.
csh
The components of argv, or variable, if supplied, are shifted to the left, discarding the first component. It is an error for the variable
not to be set or to have a null value.
ksh
The positional parameters from $n+1 $n+1 ... are renamed $1 ..., default n is 1. The parameter n can be any arithmetic expression that
evaluates to a non-negative number less than or equal to $#.
On this manual page, ksh(1) commands that are preceded by one or two * (asterisks) are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. Words, following a command preceded by ** that are in the format of a variable assignment, are expanded with the same rules as a
variable assignment. This means that tilde substitution is performed after the = sign and word splitting and file name genera-
tion are not performed.
ksh93
shift is a shell special built-in that shifts the positional parameters to the left by the number of places defined by n, or 1 if n is
omitted. The number of positional parameters remaining is reduced by the number of places that are shifted.
If n is specified, it is evaluated as an arithmetic expression to determine the number of places to shift. It is an error to shift more
than the number of positional parameters or a negative number of places.
The following exit values are returned by shift in ksh93:
0 Successful completion. The positional parameters were successfully shifted.
>0 An error occurred.
On this manual page, ksh93(1) commands that are preceded by one or two + are treated specially in the following ways:
1. Variable assignment lists preceding the command remain in effect when the command completes.
2. I/O redirections are processed after variable assignments.
3. Errors cause a script that contains them to abort.
4. They are not valid function names.
5. Words, following a command preceded by ++ that are in the format of a variable assignment, are expanded with the same rules as a
variable assignment. This means that tilde substitution is performed after the = sign and field splitting and file name genera-
tion are not performed.
ATTRIBUTES
See attributes(5) for descriptions of the following attributes:
+-----------------------------+-----------------------------+
| ATTRIBUTE TYPE | ATTRIBUTE VALUE |
+-----------------------------+-----------------------------+
|Availability |SUNWcsu |
+-----------------------------+-----------------------------+
SEE ALSO csh(1), ksh(1), ksh93(1), sh(1), attributes(5)SunOS 5.11 20 Nov 2007 shift(1)