Help with Shell Scripts Using sed in multiple files.
Hi, I was hoping that someone could help me. I have a problem that i am trying to work on and it requires me to change text within multiple files using sed. What i have so far is
Code:
!/bin/sh
File1="$3"
File2="$4"
File3="$5"
testNum="$File1"
while test "$testNum" <= "$File3";
do
echo "$File3"
A="$1"
echo $A
B="$2"
C="$3"
echo "$A" | sed -e 's/\([*.[^$]\)/\\\1/g' > temporary
A="`cat 'temporary'`"
rm temporary
echo "$A"
sed "s/$A/$B/g" "$C" > myFile.txt.updated
mv myFile.txt.updated "$C"
cat "$C"
done
When ever i try to execute it it says that it cannot =: open such file
What are $3, $4, $5? Give an example of how you use your program.
You forgot the # in front of the first line. Needs to be #!/bin/sh
You don't need to use the 'test' executable here -- just put your expression in brackets. while [ "$testNum" <= "$File3" ] That is the actual cause of the error here -- without the [ ] , it assumes the < is a file redirection and tries to read from a file named "=". I'm guessing you're doing string comparison there. If you're not, please explain, because it looks a bit odd.
There's quite a few inefficiencies in your code, if you explain what you're trying to do in detail we can show you better ways.
I use the program to change an occurance of a word throughout different files that are being tested. At first i had to Create a new script, sub2, taking the same three parameters (replacing an occurance of a word in a shell script), that treats the string to be replaced as plain text instead of as a regular expression. I did that and now I have Generalize my sub2 script, producing a new script sub3 that will apply a substitution to any number of files given on the command line. For example
~/UnixCourse/scriptAsst/sub3 foo bar myFile1.txt myFile2.txt
myFile3.txt
should apply the same substitution throughout each of the three files named there.
I took that part out and now i have
Code:
#!/bin/sh
File1="$3"
File2="$4"
File3="$5"
testNum="$File1"
for file in ~/*
do
echo $testNum
A="$1"
echo $A
B="$2"
C="$3"
echo "$A" | sed -e 's/\([*.[^$]\)/\\\1/g' > temporary
A="`cat 'temporary'`"
rm temporary
echo "$A"
sed "s/$A/$B/g" "$C" > myFile.txt.updated
mv myFile.txt.updated "$C"
cat "$C"
done
Last edited by Corona688; 08-09-2012 at 07:24 PM..
#!/bin/sh
# Save first two parameters
A="$1"
B="$2"
shift 2 # Get rid of first two parameters
while [ "$#" -gt 0 ]
do
sed "s/$A/$B/g" $1 > $1.new
shift
done
#!/bin/sh
# Save first two parameters
A="$1"
B="$2"
shift 2 # Get rid of first two parameters
while [ "$#" -gt 0 ]
do
sed "s/$A/$B/g" $1 > $1.new
shift
done
When i try that, it still says that it produced incorrect output. I can not find the error that is happeneng
Sorry for the confusion. I entered in the code you showed, and ran a program that takes that code and uses it on different files. While in the file it finds a certain expression and replaces it with another. When i ran the program it said that sub3 (the program code i am trying to write) produced incorrect output on test 28:
I am not sure what I am doing wrong here. The code should work fine. I have been making small changes insuring that each new bit works. Now running my sed through multiple files I am getting incorrect output. Any help and instruction would be greatly appreciated.
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08-09-2012
