Login or Register to Ask a Question and Join Our Community


Shell Programming and Scripting

help with a ksh script

Login to Discuss or Reply to this Discussion in Our Community

 
Thread Tools Search this Thread
Top Forums Shell Programming and Scripting help with a ksh script
# 8  
Old 05-03-2007
Quote:
Originally Posted by csnewbie84
cfajohnson or anyone else,

personal opinion...would you use this in the script

Code:
if [[ $# != 2 ]]
then
print "Usage: $0 $pattern1 $pattern2"
exit
fi

cause I think it don't have to be there...I would thought the the do statement is the important part of the script.

I wouldn't use [[ ... ]] or !=; I'd use [ $# -ne 2 ].

But, yes, I would use something there or the script might fail if the wrong number of arguments are given.

# 9  
Old 05-03-2007
Alrighty...here's what I got (with your help...hopefully I did this right...just learning this stuff 2 weeks ago)

Code:
#!/bin/ksh
pattern1=$1
pattern2=$2

if [ $# -ne 2 ]
then
print "Usage: $0 $pattern1 $pattern2"
exit
fi

for file in *
do
cp $3 /tmp/$3
sed -e 's/$pattern1/$pattern2/g'/tmp/$3 > $3
done

Does that look about right?

BTW In case you wondering why I using $3. $3 is the name of the file in which to make the substitution.
# 10  
Old 05-03-2007

It looks good, apart from a few problems:
  • You should quote variables. Your script will fail if $3 contains a space, for example.
  • Use double quotes, or the pattern variables will not be expanded
  • If the patterns may contain slashes, change the delimiter or escape the slashes
  • Note that the replacement is a string, not a pattern
Code:
cp "$3" "/tmp/$3"
sed -e "s/$pattern1/$pattern2/g" "/tmp/$3" > "$3"

# 11  
Old 05-04-2007
i have always been more fond of the following:

for file in *; do
sed "s/$pattern1/$pattern2/g" < ${file} > ${file}.$$ && {
mv ${file}.$$ ${file}
}
done

so sed dumps into file.$$ ($$ = pid of script) then upon success (&&) it moves the new file to the original name
# 12  
Old 05-04-2007
Why bother bracing a single command?
# 13  
Old 05-06-2007
if the command fails you do not over write the original file and can see the output of the command by looking at the temp file
# 14  
Old 05-06-2007
Quote:
Originally Posted by TinWalrus
if the command fails you do not over write the original file and can see the output of the command by looking at the temp file
The braces have nothing to do with that, the && is sufficient.
Login or Register to Ask a Question

Previous Thread | Next Thread

10 More Discussions You Might Find Interesting

1. Shell Programming and Scripting

Script to replace lines in ksh Script

Hi All, I am novice to Unix and I need your expert advice for the below task. There is a KSH script file in which I need to replace few line as per the below expectations. So my file look like as # Host Setup Command: Line 1 Line 2 Line 3 Line 4 Line Any... (6 Replies)
Discussion started by: rupid0609
6 Replies

2. Shell Programming and Scripting

Deploy ksh script to file from other script

Hi all, I need to deploy two scripts on around ~100 machines and have only OPSware. Opsware have the option to execute a script, so I am trying to write a script which dose cat > script.ksh <<EOF script to be deployed EOF However the script between the two EOFs gets also executed which... (0 Replies)
Discussion started by: click
0 Replies

3. Shell Programming and Scripting

Help Create dynamic ksh script from a script

I am currently running 2 scripts to gather data for a 3rd script and would like to combine the 2 scripts into one. Having issues with the final output format. Note cannot post URL so replaced the http stuff with (name) in the examples All scripts contain #!/bin/ksh OS = Red Hat Enterprise... (0 Replies)
Discussion started by: pcpinkerton
0 Replies

4. Shell Programming and Scripting

KSH script to run other ksh scripts and output it to a file and/or email

Hi I am new to this Scripting process and would like to know How can i write a ksh script that will call other ksh scripts and write the output to a file and/or email. For example ------- Script ABC ------- a.ksh b.ksh c.ksh I need to call all three scripts execute them and... (2 Replies)
Discussion started by: pacifican
2 Replies

5. Shell Programming and Scripting

passing a variables value from the called script to calling script using ksh

How do i get the value of the variable from the called script(script2) to the calling script(script1) in ksh ? I've given portion of the script here to explain the problem. Portion of Script 1 ============= ----- ----- tmp=`a.ksh p1 p2 p3` if then # error processing fi -----... (10 Replies)
Discussion started by: rajarkumar
10 Replies

6. Shell Programming and Scripting

import var and function from ksh script to another ksh script

Ih all, i have multiples ksh scripts for crontab's unix jobs they all have same variables declarations and some similar functions i would have a only single script file to declare my variables, like: var1= "aaa" var2= "bbb" var3= "ccc" ... function ab { ...} function bc { ... }... (2 Replies)
Discussion started by: wolfhurt
2 Replies

7. Shell Programming and Scripting

tracing a ksh script within a ksh script

I normally trace a script with the ksh -x <script name> and redirect strderr to file. But if you have a script like the examble below...... vi hairy bear=`grep bear animals` if then ksh more_animals fi If I ksh -x hairy it won't trace "more_animals" unless I put a -x in it. Is... (1 Reply)
Discussion started by: shorty
1 Replies

8. Shell Programming and Scripting

how to convert unix .ksh script to windows .batch script

I am using awk in my .ksh script but when I am trying to run in windows its not recognising awk part of the ksh script , even when I changed it to gawk it does not work, this is how my .ksh and .bat files look like. thanx. #!/bin/ksh egrep -v "Rpt 038|PM$|Parameters:|Begin |Date: |End... (1 Reply)
Discussion started by: 2.5lt V8
1 Replies

9. Shell Programming and Scripting

executing a ksh script from another ksh script

Hi, I'm new to unix scripting.How can i call a script from another script. I have a.ksh and b.ksh .I have to call b.ksh from a.ksh after it is successfully exceuted. I tried using #!/bin/ksh -x in a.ksh and at the end i have used /path/b.ksh My problem is it is executing only a.ksh.it... (6 Replies)
Discussion started by: ammu
6 Replies

10. UNIX for Dummies Questions & Answers

SQL Script run in KSH Script

I've got a SQL script that is executed through a UNIX ksh script. It is working fine, but I wanted to add a line to put a date/time stamp in the log file that it generates. This is more of a SQL question, but I'm hoping someone can help me get the date/time...I've changed the script with the... (2 Replies)
Discussion started by: dstinsman
2 Replies
Login or Register to Ask a Question