Substitution in a variable


 
Thread Tools Search this Thread
Top Forums UNIX for Advanced & Expert Users Substitution in a variable
# 1  
Old 10-17-2001
Substitution in a variable

Hey All,

I'm trying to clean up a variable using sed but It dosn't seem to work. I'm trying to find all the spaces and replace them with "\ " (a slash and a space). For Example "Hello World" should become "Hello\ World". But it does nothing. If I put it directly into the command line it works fine. Here's my code...


#!/bin/sh


var_name="Hello World"
echo "var_name is $var_name"
var_name=`echo $var_name |sed 's/ /\\ /g'`
echo "Cat_name has changed to $Cat_name"

Thanks,
G
# 2  
Old 10-18-2001
First thing I noticed, was that you would echo out $Cat_name. You didn't define Cat_name. The other thing I did was to add another \ to the sed statement, along with the -e option... Hope that helps...

Try this:
Code:
#!/bin/sh

var_name="Hello World"
echo "var_name is $var_name"
var_name=`echo $var_name | sed -e 's/ /\\\ /g'`
echo "var_name has changed to $var_name"

# 3  
Old 10-18-2001
Re: Substitution in a variable


Hi,

just change as below :
var_name=`echo $var_name|sed 's/ / \//g'`

or for backslash :
var_name=`echo $var_name|sed 's/ / \\\/g'`

krishna

Last edited by krishna; 10-18-2001 at 01:30 AM..
# 4  
Old 10-18-2001
Sweet it works! Thanks!
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Variable substitution with arrays

Hi all, I have a script with the following gist: declare -a index=(0 1 2 3 4); declare -a animals=(dog cat horse penguin cow); declare -a fruits=(orange apple grapes peach mango); declare -a drinks=(juice milk coffee tea coke); declare -a cities=(toronto paris london glasgow... (18 Replies)
Discussion started by: Kingzy
18 Replies

2. Shell Programming and Scripting

read variable substitution

Allright so a quick question. I'm building a script that will eventually do a full IP subnet scan. It starts off by first entering an IP address, (capturing host and net ID comes after that) and I want it to use the current IP address if no input is given. Is there a quick way to define the... (1 Reply)
Discussion started by: BisMarc
1 Replies

3. Shell Programming and Scripting

Variable substitution

Hi, I have to write a shell script in which I have to substitute a variable within a variable. For example, var1=aaa var2=file.$var1.txt The output should be, echo $var2 file.aaa.txt Can someone please help me in getting this. I tried using eval, but it didnt work. I might be using it... (2 Replies)
Discussion started by: grajp002
2 Replies

4. Shell Programming and Scripting

How to use variable with command substitution in variable

For example I have variable like below echo $OUTPUT /some/path/`uname -n` when I try to use the variable OUTPUT like below cd $OUTPUT or cd ${OUTPUT} I am getting bad substituion error message $ cd $OUTPUT ksh: cd: bad substitution $ cd ${OUTPUT} ksh: cd: bad substitution ... (1 Reply)
Discussion started by: rajukv
1 Replies

5. Shell Programming and Scripting

Variable Substitution

Hi , I have a variable as follows, Temp=`cat ABC.txt | cut -c5-` This will yeild a part of the date. say , 200912. I would like to substitute this variable's value in a filename. eg: File200912F.zip when i say File$TempF.zip , it is not substituting. Any help ? Thanks in... (2 Replies)
Discussion started by: mohanpadamata
2 Replies

6. Shell Programming and Scripting

variable substitution

file1.ksh #!/bin/ksh test5_create="I am a man" # test5 will be dynamic and the value will be passed from command line a=${1}_create echo $a # i need the output as "I am a man" ./file1.ksh test5 # i run the script like this any suggessions guys... (1 Reply)
Discussion started by: giri_luck
1 Replies

7. UNIX for Dummies Questions & Answers

Variable substitution

Hi, That might be pretty simple. How can I generate a variable name and get their value ? Thanks a lot. Something like: >CUSTOMER_NF=26 > object=CUSTOMER > echo ${object}_NF CUSTOMER_NF > echo ${${object}_NF} ksh: ${${object}_NF}: 0403-011 The specified substitution is... (7 Replies)
Discussion started by: Leo_NN
7 Replies

8. Shell Programming and Scripting

Sed variable substitution when variable constructed of a directory path

Hello, i have another sed question.. I'm trying to do variable substition with sed and i'm running into a problem. my var1 is a string constructed like this: filename1 filerev1 filepath1 my var2 is another string constructed like this: filename2 filerev2 filepath2 when i do... (2 Replies)
Discussion started by: alrinno
2 Replies

9. Shell Programming and Scripting

Variable Substitution

I have run into a wall with my iptables firewall scripting. I am blocking all of the private side IP addresses on the WAN interface on systems running NAT. However, if the system is not running NAT and needs to allow access to the local LAN on the WAN interface, I need to block all but one of... (2 Replies)
Discussion started by: garak
2 Replies

10. UNIX for Dummies Questions & Answers

variable substitution

Hi everyone, I have a simple question to ask : In a script that I'm writting, I need to create variables on-the-fly. For instance, for every iterartion of the following loop a var_X variable should be generated : #!/bin/ksh a="1 2 3" for i in $a do var_${i}=$i echo "${var_$i}" done ... (1 Reply)
Discussion started by: ck-18
1 Replies
Login or Register to Ask a Question