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Homework and Emergencies Homework & Coursework Questions Need help on how to execute several programs Post 303024964 by MadeInGermany on Sunday 21st of October 2018 12:33:19 PM
Old 10-21-2018
Quote:
prog2: I understand that there are three parameters that need to be passed($1, $2p, $3), but I don't know what they are. I assume one is a file name and another is a command, but I am not sure what the third is.
That's a start.
Then you need to know how the sed command works: after the options (here: -n) the next word is the sed code. Usually one puts quotes around it, to make it better visible (and allow spaces in it). The next word(s) is(are) input files.
Compare this information with "man sed"; it starts with a short invocation description.
You need to read more in order to understand the given sed command, and what parameters make sense.
Quote:
./prog2 1,4d Zidane
These are two arguments! Parameter $1 will become 1,4d

The eqivalent of set -x in sh-derived shells is set echo in csh-derived shells. All shells take a -x option:
Code:
sh -x shscript
csh -x cshscript


Last edited by MadeInGermany; 10-21-2018 at 01:56 PM..
 

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shells(4)							   File Formats 							 shells(4)

NAME
shells - shell database SYNOPSIS
/etc/shells DESCRIPTION
The shells file contains a list of the shells on the system. Applications use this file to determine whether a shell is valid. See getuser- shell(3C). For each shell a single line should be present, consisting of the shell's path, relative to root. A hash mark (#) indicates the beginning of a comment; subsequent characters up to the end of the line are not interpreted by the routines which search the file. Blank lines are also ignored. The following default shells are used by utilities: /bin/bash, /bin/csh, /bin/jsh, /bin/ksh, /bin/ksh93, /bin/pfcsh, /bin/pfksh, /bin/pfsh, /bin/sh, /bin/tcsh, /bin/zsh, /sbin/jsh, /sbin/sh, /usr/bin/bash, /usr/bin/csh, /usr/bin/jsh, /usr/bin/ksh, /usr/bin/ksh93, /usr/bin/pfcsh, /usr/bin/pfksh, /usr/bin/pfsh, and /usr/bin/sh, /usr/bin/tcsh, /usr/bin/zsh, and /usr/sfw/bin/zsh. /etc/shells overrides the default list. Invalid shells in /etc/shells could cause unexpected behavior, such as being unable to log in by way of ftp(1). FILES
/etc/shells list of shells on system SEE ALSO
vipw(1B), ftpd(1M), sendmail(1M), getusershell(3C), aliases(4) SunOS 5.11 20 Nov 2007 shells(4)
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