Escape and command substitution in scripting Post: 303006049

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Substitution of last command

"Is there any substituation of last command or script syntax which can be used as a user. As far I know the "last" command is being used to display information about previous logins. A member of adm group or the user adm can execute it only. Thanks in advance for your usual help. Ghazi

2. Shell Programming and Scripting

Difference between "Command substitution" and "Process substitution"

Hi, What is the actual difference between these two? Why the following code works for process substitution and fails for command substitution? while IFS= read -r line; do echo $line; done < <(cat file)executes successfully and display the contents of the file But, while IFS='\n' read -r...

3. Shell Programming and Scripting

Escape Space in a ssh command

The following statement does work. But the second command does not work as expected. ssh root@123.123.123.123 \\"mysqldump -h localhost -u root -pPassWord dbName -d | gzip -cf\\" | gunzip -c > database1.sql ssh root@123.123.123.123 \\"mysqlbinlog /var/log/mysql/mysql-bin.*...

4. UNIX for Dummies Questions & Answers

sed insert command and variable expansion/command substitution

I know this script is crummy, but I was just messing around.. how do I get sed's insert command to allow variable expansion to show the filename? #!/bin/bash filename=`echo $0` /usr/bin/sed '/#include/ { i\ the filename is `$filename` }' $1 exit 0

5. Shell Programming and Scripting

Using awk with the date command and escape characters

I have a file that is a log file for web traffic. I would like to convert the timestamp in it to unix time or epoch time. I am using the date command in conjunction with awk to try to do this. Just myfile: 28/Aug/1995:00:00:38 1 /pub/atomicbk/catalog/home.gif 813 28/Aug/1995:00:00:38 1...

6. UNIX for Dummies Questions & Answers

read command - using output from command substitution

Hey, guys! Trying to research this is such a pain since the read command itself is a common word. Try searching "unix OR linux read command examples" or using the command substitution keyword. :eek: So, I wanted to use a command statement similar to the following. This is kinda taken...

7. Shell Programming and Scripting

Shell scripting substitution techniques

Hi guys, I'm looking for some thoughts on this. I'm trying to do a clean 1 liner to substitute some values. What I have: sed 's/Personid=.*/Personid=xxxxxx/' $tmpFileOut sed 's/Person:.*/Person:xxxxxx/' $tmpFileOut sed 's/PersonID:.*/PersonID: xxxxxx/' $tmpFileOut Obviously that's a bit...

8. Shell Programming and Scripting

Using C-Shell Scripting for Substitution

mv myFile.txt myFile.txt.bak sed s/foo/bar/g myFile.txt.bak > myFile.txt Turn the two-line version, above, of the substitution commands into a shell script, subst1 taking three parameters: the string to be replaced the string with which to replace it the name of the file in which to make the...

9. Shell Programming and Scripting

Auto escape script to escape special chars in script args

This is a bit off the wall, but I often need to run scripts where there are argument values that contain special characters. For example, $ ./process.exe -t M -N -o temp.mol.s -i ../molfiles/N,N\',N\'\'-trimethylbis$hexamethylene$triamine.mol && sfile_space_to_tab.sh temp.mol.s temp.s It...

10. Shell Programming and Scripting

Regarding command substitution

Oracle Linux 5.6, 64-bit Given the following snippet wrkvar=`sqlplus -s / as sysdba <<EOF set echo off feedback off head off trimsp on select count(*) from v\$parameter where name in ('db_file_name_convert','log_file_name_convert') and value is not null; EOF` echo wrkvar=$wrkvarProduces...

LEARN ABOUT OPENSOLARIS

posix_madvise

posix_madvise(3C)					   Standard C Library Functions 					 posix_madvise(3C)

NAME

       posix_madvise - memory advisory information

SYNOPSIS

       #include <sys/mman.h>

       int posix_madvise(void *addr, size_t len, int advice);

DESCRIPTION

       The posix_madvise() function advises the system on the expected behavior of the application with respect to the data in the memory starting
       at address addr, and continuing for len bytes. The system may use this  information  to	optimize  handling  of	the  specified	data.  The
       posix_madvise()	function has no effect on the semantics of access to memory in the specified range, although it may affect the performance
       of access.

       The advice to be applied to the memory range is specified by the advice parameter and may be one of the following values:

       POSIX_MADV_NORMAL	Specifies that the application has no advice to give on its behavior with respect to the specified  range.  It	is
				the default characteristic if no advice is given for a range of memory.

       POSIX_MADV_SEQUENTIAL	Specifies  that  the application expects to access the specified range sequentially from lower addresses to higher
				addresses.

       POSIX_MADV_RANDOM	Specifies that the application expects to access the specified range in a random order.

       POSIX_MADV_WILLNEED	Specifies that the application expects to access the specified range in the near future.

       POSIX_MADV_DONTNEED	Specifies that the application expects that it will not access the specified range in the near future.

       These values are defined in <sys/mman.h>

RETURN VALUES

       Upon successful completion, posix_madvise() returns zero. Otherwise, an error number is returned to indicate the error.

ERRORS

       The posix_madvise() function will fail if:

       EINVAL	 The value of advice is invalid.

       ENOMEM	 Addresses in the range starting at addr and continuing for len bytes are partly or completely outside the range allowed  for  the
		 address space of the calling process.

       The posix_madvise() function may fail if:

       EINVAL	 The value of len is zero.

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Committed 		   |
       +-----------------------------+-----------------------------+
       |MT-Level		     |MT-Safe			   |
       +-----------------------------+-----------------------------+
       |Standard		     |See standards(5). 	   |
       +-----------------------------+-----------------------------+

SEE ALSO

       mmap(2), madvise(3C), posix_madvise(3C), attributes(5), standards(5)

SunOS 5.11							    14 Jul 2008 						 posix_madvise(3C)

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Substitution of last command

Discussion started by: ghazi

2. Shell Programming and Scripting

Difference between "Command substitution" and "Process substitution"

Discussion started by: royalibrahim

3. Shell Programming and Scripting

Escape Space in a ssh command

Discussion started by: shantanuo

4. UNIX for Dummies Questions & Answers

sed insert command and variable expansion/command substitution

Discussion started by: glev2005