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Question regarding cat command


 
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Top Forums Shell Programming and Scripting Question regarding cat command
# 8  
Old 08-06-2009
Quote:
Originally Posted by asirohi
Hi,
I chaged the script a little bit,
#!/bin/sh

FIX_XML_PATH=/home/administrator/testfix/fix
FIX_FILE=`ls $FIX_XML_PATH | grep xml`

echo $FIX_FILE
cat $FIX_FILE

Variable $FIX_FILE store a xml file.Smilie


*******logs*******


$ sh -vx xmlParse.sh
#!/bin/sh

FIX_XML_PATH=/home/administrator/testfix/fix
+ FIX_XML_PATH=/home/administrator/testfix/fix
FIX_FILE=`ls $FIX_XML_PATH | grep xml`
ls $FIX_XML_PATH | grep xml
++ ls /home/administrator/testfix/fix
++ grep xml
+ FIX_FILE=fix_com.ibm.rational.clearcase.nt_i386.ifix0003_7.1.2.0000-7-
0-2009B-TESTFIX-CC-D090803_for_7.1.2.0000-7-1-0-02-00-2009B-D090617.xml

echo $FIX_FILE
+ echo fix_com.ibm.rational.clearcase.nt_i386.ifix0003_7.1.2.0000-7-1-0-
09B-TESTFIX-CC-D090803_for_7.1.2.0000-7-1-0-02-00-2009B-D090617.xml
fix_com.ibm.rational.clearcase.nt_i386.ifix0003_7.1.2.0000-7-1-0-02-00-2
TFIX-CC-D090803_for_7.1.2.0000-7-1-0-02-00-2009B-D090617.xml
cat $FIX_FILE
+ cat fix_com.ibm.rational.clearcase.nt_i386.ifix0003_7.1.2.0000-7-1-0-0
9B-TESTFIX-CC-D090803_for_7.1.2.0000-7-1-0-02-00-2009B-D090617.xml
cat: fix_com.ibm.rational.clearcase.nt_i386.ifix0003_7.1.2.0000-7-1-0-02
B-TESTFIX-CC-D090803_for_7.1.2.0000-7-1-0-02-00-2009B-D090617.xml: No su
or directory
In the result of the ls command, the path is not present.
Modify your script :
Code:
#!/bin/sh

FIX_XML_PATH=/home/administrator/testfix/fix
FIX_FILE=`ls $FIX_XML_PATH | grep xml`

echo $FIX_FILE
cat $FIX_XML_PATH/$FIX_FILE

jean-Pierre.
# 9  
Old 08-06-2009
thaks scottn, i got got that, i will keep in mind the way you told me.

Take care guys
-Adi
# 10  
Old 08-06-2009
The output from "ls" does not include" the directory name.
A quick fix is to "cd" to the directory first.
Other correspondents have raised potential issues with getting multiple hits. We can only comment if we can see sample filename(s). Your code is written as if the string "xml" can appear anywhere in the filename and you are only expecting one file.

Code:
#!/bin/sh

FIX_XML_PATH=/home/administrator/testfix/fix
FIX_FILE=`ls $FIX_XML_PATH | grep xml`

cd ${FIX_XML_PATH}

echo $FIX_FILE
cat $FIX_FILE

# 11  
Old 08-06-2009
For something that doesn't choke on multiple files or embedded spaces, use something like:
Code:
find $FIX_XML_PATH -type f -name "*xml*" | while file=$(line)
do
  basename "$file"
  cat "$file"
done

# 12  
Old 08-06-2009
Quote:
Originally Posted by mac4rfree
franklin, one interesting i found,

Code:
ad02 $ cat $a
10081551
10081599
10082234
10082259
20081134
20081159
30082232
10087721
kjlsab;kfd
kjbnaskj
kjabn;kj
akjldsb;k
akj;dhbsa
ad02 $ cat "$a"
cat: 0652-050 Cannot open aout.xml
bout.xml
cout.xml.
ad02 $ echo $a
aout.xml bout.xml cout.xml
ad02 $

here without quotes, it opens all the three files, but with quotes, it is throwing an error.
If there are more files the use of double quotes is not a good idea, but if you have file names with spaces in the variable then you have a problem. With double quotes the files are passed as one literal string, check the difference between:

Code:
cat "aout.xml bout.xml cout.xml"

and

Code:
cat aout.xml bout.xml cout.xml


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