Extracting value of a variable


 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting Extracting value of a variable
# 15  
Old 09-18-2015
As an addendum an example of multiple variables...
OSX 10.7.5, default terminal using 'sh'...
Code:
#!/bin/sh
# Value_extractor.sh Variable[?]
echo 'echo "Sourcing..."' > /tmp/FileA
echo 'Variable1="This is a string...";' >> /tmp/FileA
echo 'Variable2="My_name_is_Bazza..."' >> /tmp/FileA
echo 'Variable3="1234567890"' >> /tmp/FileA
echo 'echo "Sourcing done!"' >> /tmp/FileA
. /tmp/FileA
# eval echo '$'"$1" > /tmp/someval
# Retrieved_value=$( cat /tmp/someval )
Retrieved_value=$( eval echo '$'"$1" )
echo $Retrieved_value

Results:-
Code:
Last login: Fri Sep 18 09:18:02 on ttys000
AMIGA:barrywalker~> cd Desktop/Code/Shell
AMIGA:barrywalker~/Desktop/Code/Shell> ./Value_extractor.sh Variable1
Sourcing...
Sourcing done!
This is a string...
AMIGA:barrywalker~/Desktop/Code/Shell> ./Value_extractor.sh Variable2
Sourcing...
Sourcing done!
My_name_is_Bazza...
AMIGA:barrywalker~/Desktop/Code/Shell> ./Value_extractor.sh Variable3
Sourcing...
Sourcing done!
1234567890
AMIGA:barrywalker~/Desktop/Code/Shell> _

Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Extracting substring from variable

Hi All, I'm facing issue wherein I have 2 character string like 'CR' and 'DR' and I want to extract just 1st character but am unable to do it. I tried below options but they are returning me 2nd character only, var="CR" echo ${var:1} returns just "R" echo ${var:0} returns "CR" ... (5 Replies)
Discussion started by: arvindshukla81
5 Replies

2. Shell Programming and Scripting

Extracting substrings from a string of variable length

I have a string like Months=jan feb mar april x y .. Here the number of fields in Months is not definite I need to extract each field in the Months string and pass it to awk . Don't want to use for in since it is a loop . How can i do it (2 Replies)
Discussion started by: Nevergivup
2 Replies

3. Shell Programming and Scripting

Extracting characters and storing in some variable

eg: ./myProgram.sh filename.cpp I want to remove the :".cpp" extension from the filename.cpp expected output: filename (3 Replies)
Discussion started by: umesh314
3 Replies

4. Shell Programming and Scripting

extracting Number variable and the following digits.

HI all, I have output of something like this: crab: ExitCodes Summary >>>>>>>>> 12 Jobs with Wrapper Exit Code : 50117 List of jobs: 1-12 See https:///twiki/something/ for Exit Code meaning crab: ExitCodes Summary >>>>>>>>> 5 Jobs with Wrapper Exit Code : 8001 List of... (20 Replies)
Discussion started by: emily
20 Replies

5. Red Hat

How to pass value of pwd as variable in SED to replace variable in a script file

Hi all, Hereby wish to have your advise for below: Main concept is I intend to get current directory of my script file. This script file will be copied to /etc/init.d. A string in this copy will be replaced with current directory value. Below is original script file: ... (6 Replies)
Discussion started by: cielle
6 Replies

6. Shell Programming and Scripting

Extracting variable value from file

Hi All i have created a file as below cat > REJ_FILE_LIST.dat CUST.DAT,$ABC/TEST.DAT|$ABC/TEST1.DAT|$ABC/TEST2.dat Ctrl+d in another script the variable is set as ABC='/data/proj/Cust' the requirement is to read the second column from file REJ_FILE_LIST.dat which contains... (1 Reply)
Discussion started by: zulfi123786
1 Replies

7. Shell Programming and Scripting

Extracting data from SQL using a variable from a file

Though, its not new, I am a newbie to shell scripting. Please help me with the below. There are two steps. First one is to read a table and create a file with the distinct values. I am able to get this done. Second step is to read the file (which has the single value, like a number) and... (1 Reply)
Discussion started by: singas1
1 Replies

8. Shell Programming and Scripting

Extracting a word from a variable

Hi Guys, Need you quick assistance on the below, trying to extract a word from a variable i.e. acmi101acmi102acmi103acmi104 When i use the following code awk '{gsub(/cmi102/,"")};1' it leaves a space in the variable, need to get rid of the space that it leaves. Any ideas. the above... (3 Replies)
Discussion started by: eo29
3 Replies

9. Shell Programming and Scripting

How to define a variable with variable definition is stored in a variable?

Hi all, I have a variable say var1 (output from somewhere, which I can't change)which store something like this: echo $var1 name=fred age=25 address="123 abc" password=pass1234 how can I make the variable $name, $age, $address and $password contain the info? I mean do this in a... (1 Reply)
Discussion started by: freddy1228
1 Replies

10. Shell Programming and Scripting

extracting value in variable??

Hi in Below example. i want "n = aa.txt.gz" ????????????? plz help m=aa.txt n=echo`gzip $m` echo $n (1 Reply)
Discussion started by: manish.s
1 Replies
Login or Register to Ask a Question
ppmtosixel(1)						      General Commands Manual						     ppmtosixel(1)

NAME
ppmtosixel - convert a portable pixmap into DEC sixel format SYNOPSIS
ppmtosixel [-raw] [-margin] [ppmfile] DESCRIPTION
Reads a portable pixmap as input. Produces sixel commands (SIX) as output. The output is formatted for color printing, e.g. for a DEC LJ250 color inkjet printer. If RGB values from the PPM file do not have maxval=100, the RGB values are rescaled. A printer control header and a color assignment table begin the SIX file. Image data is written in a compressed format by default. A printer control footer ends the image file. OPTIONS
-raw If specified, each pixel will be explicitly described in the image file. If -raw is not specified, output will default to com- pressed format in which identical adjacent pixels are replaced by "repeat pixel" commands. A raw file is often an order of magni- tude larger than a compressed file and prints much slower. -margin If -margin is not specified, the image will be start at the left margin (of the window, paper, or whatever). If -margin is speci- fied, a 1.5 inch left margin will offset the image. PRINTING
Generally, sixel files must reach the printer unfiltered. Use the lpr -x option or cat filename > /dev/tty0?. BUGS
Upon rescaling, truncation of the least significant bits of RGB values may result in poor color conversion. If the original PPM maxval was greater than 100, rescaling also reduces the image depth. While the actual RGB values from the ppm file are more or less retained, the color palette of the LJ250 may not match the colors on your screen. This seems to be a printer limitation. SEE ALSO
ppm(5) AUTHOR
Copyright (C) 1991 by Rick Vinci. 26 April 1991 ppmtosixel(1)