combine 2 lines (command & echo) Post: 8053

Sponsored Content

Top Forums UNIX for Dummies Questions & Answers combine 2 lines (command & echo) Post 8053 by LivinFree on Friday 5th of October 2001 12:55:14 AM

10-05-2001

Registered User

Hmm, the above seems to work for me...

Here's how I personally would do it (I'm not trying to do it all for you, I just think that there's so many ways to do it - this may give you a few new ideas to tackle your own script):

Code:

#!/bin/sh
use_msg () {
echo "Usage:  `basename $0` [name]"
}

if [ "$#" -ne "1" ] ; then
        use_msg
        exit 2
fi
name_t=`grep ^${1} /etc/passwd | cut -d: -f5 | cut -d, -f1`
if [ "$name_t" = "" ] ; then
        name="$1"
else
        name="$name_t"
fi
who | grep $1 >/dev/null 2>&1
if [ "$?" = "0" ] ; then
        logg=""
else
        logg="not "
fi
echo "${name} is ${logg}logged in"

Did you catch what happened with the "logg" variable? It's important to have a space after "not", to seperate the words. Also, this script does not check to see if that username even exists... it will simply say that the user is not logged in, since there is no GECOS data...
One more thing: I added another cut statement, because my GECOS info is comma delimited - the way the script was before, I was seeing the entire field, not just that name.

Hope this gives you a few ideas...

LivinFree

View Public Profile for LivinFree

Find all posts by LivinFree

10 More Discussions You Might Find Interesting

1. UNIX for Dummies Questions & Answers

Combine two lines

Hi I have a file with the records 1 A B C D 2 E F G H 3 I J K L 4 M N O P In the ouput I want 1 A B C D 2 # F G H 3 I J K L 4 M N O P How to achieve this?

2. What is on Your Mind?

[[ $(date +%Y) == 2007 ]] && echo "Happy New Year"

Same as the Title! :)

3. Shell Programming and Scripting

combine 2 lines

Moderator, kindly delete this thread because I already found what I needed... thanks.

4. Shell Programming and Scripting

combine two perl lines into a single perl command

Hi Everyone, i have a string 00:44:40 so: $tmp=~ s/://gi; $tmp=~s/({2})({2})({2})/$1*3600+$2*60+$3/e; the output is 2680. Any way to combine this two lines into a single line? Thanks

5. Shell Programming and Scripting

Append && echo "success" to all commands

I am learning to build from SVN and other tools, with a lot of copying and pasting from forums. I like to append && echo "success" to all commands so that I can see at a glance if things went all right. Is there a way that I can have the bash shell append this to all commands? Thanks!

6. Shell Programming and Scripting

Perl: combine Backtick & system() I/O operation?

Hi - Within perl I want to execute a system command. I want to re-direct all the output from the command to a file (@result = `$cmd`;), but I ALSO want the results to be displayed on the screen (system("$cmd"); The reason is this - if the command completes, I want to process the output. If the...

7. Shell Programming and Scripting

How to combine lines?

Hi, I have a file like this: "sdfc@abc.com","arovls","some addr ", "more stuff" "ssss@email.com","arovls","some addr", "sss" "edx@email.com","arovls","some addr", "sssdfvv" "ssss@a55.com","arovls","some addr", "lsdsdgf" "ssss@0234.com","aro vls","123 Main", "lSdfv" I want to...

8. Shell Programming and Scripting

How to combine 2 files and output the unique & difference?

Hi Guys, I have two input files and I want to combine them and get the unique values and differences and put them into one file. See below desired output file. Inputfile1: 1111111 2222222 3333333 7860068 7860069 7860071 7860072 Inputfile2: 4444444

9. Shell Programming and Scripting

awk to combine lines if fields match in lines

In the awk below, what I am attempting to do is check each line in the tab-delimeted input, which has ~20 lines in it, for a keyword SVTYPE=Fusion. If the keyword is found I am splitting $3 using the . (dot) and reading the portion before and after the dot in an array a. If it does have that...

10. Shell Programming and Scripting

awk to remove lines that do not start with digit and combine line or lines

I have been searching and trying to come up with an awk that will perform the following on a converted text file (original is a pdf). 1. Since the first two lines are (begin with) text they are removed 2. if $1 is a number then all text is merged (combined) into one line until the next...

LEARN ABOUT REDHAT

cut

CUT(1)									FSF								    CUT(1)

NAME

       cut - remove sections from each line of files

SYNOPSIS

       cut [OPTION]... [FILE]...

DESCRIPTION

       Print selected parts of lines from each FILE to standard output.

       Mandatory arguments to long options are mandatory for short options too.

       -b, --bytes=LIST
	      output only these bytes

       -c, --characters=LIST
	      output only these characters

       -d, --delimiter=DELIM
	      use DELIM instead of TAB for field delimiter

       -f, --fields=LIST
	      output only these fields;  also print any line that contains no delimiter character, unless the -s option is specified

       -n     with -b: don't split multibyte characters

       -s, --only-delimited
	      do not print lines not containing delimiters

       --output-delimiter=STRING
	      use STRING as the output delimiter the default is to use the input delimiter

       --help display this help and exit

       --version
	      output version information and exit

       Use one, and only one of -b, -c or -f.  Each LIST is made up of one range, or many ranges separated by commas.  Each range is one of:

       N      N'th byte, character or field, counted from 1

       N-     from N'th byte, character or field, to end of line

       N-M    from N'th to M'th (included) byte, character or field

       -M     from first to M'th (included) byte, character or field

       With no FILE, or when FILE is -, read standard input.

AUTHOR

       Written by David Ihnat, David MacKenzie, and Jim Meyering.

REPORTING BUGS

       Report bugs to <bug-coreutils@gnu.org>.

COPYRIGHT

       Copyright (C) 2002 Free Software Foundation, Inc.
       This is free software; see the source for copying conditions.  There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICU-
       LAR PURPOSE.

SEE ALSO

       The full documentation for cut is maintained as a Texinfo manual.  If the info and cut programs are properly installed at  your	site,  the
       command

	      info cut

       should give you access to the complete manual.

cut (coreutils) 4.5.3						   February 2003							    CUT(1)