1. Because the PATH variable defines the directories your shell looks in for commands you type that aren't built into the shell. For instance if you type ls, and ls isn't an internal shell command, it looks through the directories in PATH for an executable file with the same name as the command you typed and tries to execure it. /bin and /usr/bin are used to store commonly used executable files such as ls, grep, chmod, etc.
2. Because the `` quotes are command substitution quotes. the shell will execute the command between them and then substitute is ouput in place of `command` as if you had typed it. `date` tries to run a command named whatever date outputs on your system.
3. Its easiest to use three seperate commands. If it takes longer to figure out how to do something in one command than it takes to type 3 and computing resources aren't an issue because you are only going to do it once or you have a tiny amount of data, why waste your time trying to figure out how to make a complex command work?
4. ${d-*} means if d is unset then assign * to d. see the parameter expansion section of the ksh, sh, or bash man page for more info.
5. yes
why are you doing his homework in full ?
This User Gave Thanks to ghostdog74 For This Post:
1. You have a very large file, named 'ColMe', tab-delimited, you are asked to process. You are told that each line in 'ColMe' has 7 columns, and that the values in the 5th column are integers. Using shell functions (and standard LINUX/UNIX filters), indicate how you would verify that these... (1 Reply)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
Hello,
My name is Jordan and studying at the New Bulgarian University in Sofiya. This is my homework but can... (2 Replies)
1. Write a shell script to print the file names of all files having .txt extension of a given directory after converting to uppercase letters. The input (directory name) should be given as command line argument. The script will also check whether sufficient arguments are passed or not and whether... (1 Reply)
A shell script is a script written for the shell, or command line interpreter, of an operating system. Typical operations performed by shell scripts include file manipulation, program execution, printing text etc.
Shell : In computing, a shell is a piece of software that provides an interface for... (1 Reply)
plz i need code to search about numbers like this :
962785785698
962795565488
962785321565
962777321684
962795979515
i need code to detect just numbers start with "96278"
i need it in awk !!
thanks (1 Reply)
Use and complete the template provided. The entire template must be completed. If you don't, your post may be deleted!
1. The problem statement, all variables and given/known data:
2. Relevant commands, code, scripts, algorithms:
Write a command to display lines ending with the... (1 Reply)
Discussion started by: elh009
1 Replies
LEARN ABOUT LINUX
debconf-mergetemplate
DEBCONF-MERGETEMPLATE(1) Debconf DEBCONF-MERGETEMPLATE(1)NAME
debconf-mergetemplate - merge together multiple debconf template files
SYNOPSIS
debconf-mergetemplate [options] [templates.ll ...] templates
DESCRIPTION
Note: This utility is deprecated. You should switch to using po-debconf's po2debconf program.
This program is useful if you have multiple debconf templates files which you want to merge together into one big file. All the specified
files will be read in, merged, and output to standard output.
This can be especially useful if you are dealing with translated template files. In this case, you might have your main template file, plus
several other files provided by the translators. These files will have translated fields in them, and maybe the translators left in the
english versions of the fields they translated, for their reference.
So, you want to merge together all the translated templates files with your main templates file. Any fields that are unique to the
translated files need to be added in to the correct templates, but any fields they have in common should be superseded by the fields in the
main file (which might be more up-to-date).
This program handles that case properly, just list each of the translated templates files, and then your main templates file last.
OPTIONS --outdated
Merge in even outdated translations. The default is to drop them with a warning message.
--drop-old-templates
If a translation has an entire template that is not in the master file (and thus is probably an old template), drop that entire
template.
SEE ALSO debconf-getlang(1)AUTHOR
Joey Hess <joeyh@debian.org>
2012-09-10 DEBCONF-MERGETEMPLATE(1)