Question regarding cat......

[Joe Profaizer]

I need to build the command: cat SanNon1MAR2005.txt SanNon2MAR2005.txt > SanNonMAR2005
when given a variable containing "SanNonMAR2005". And that's all we have to work with.

I need to split the contents of the variable into 2 pieces (SanNon) and (MAR2005) and insert a "1" and a "2" where necessary to build the stmt above.

If InputFile is my variable then 'echo $Inputfile | cut -c1-6' would give me SanNon. That's about as far as I've gotten....

[A. Clay Stephenson]

There are many ways to do this and if you look at an earlier patterm matching thread today you would get some good Perl ideas but to fix your approach:

PT1=$(echo "${Inputfile}" | cut -c1-6)
PT2=$(echo "${Inputfile}" | cut -c7-)

V1="${PT1}1${PT2}"
echo "V1 = ${V1}"
V2="${PT1}2${PT2}"
echo "V2 = ${V2}"

[RAC_1]

var='SanNonMAR2005'
echo ${var#SanNon}
echo ${var%MAR*}

Anil

[Sandman!]

Joe,

Here's what you are looking for:
=============================================
Inputfile=SanNonMAR2005

echo $Inputfile | awk -F"M" 'BEGIN{OFS="M"} {print $1"1",$2}'
=============================================

the above code will give you "SanNon1MAR2005.txt". Replace the "1" in the awk command with the appropriate number (say 2) to build your cat command.

hope this helps!

[A. Clay Stephenson]

As I mentionioned earlier Perl is really the way to go for pattern matching.

Try this:
-----------------------------------
#!/usr/bin/sh

typeset -i STAT=1
typeset FNAME=''
typeset PT1=''
typeset MON=''
typeset YR=''
while [[ ${STAT} -ne 0 ]]
do
echo "Enter Filename: \c"
read FNAME
perl -e 'if ($ARGV[0] =~ /(.+)(JAN|FEB|MAR|APR|MAY|JUN|JUL|AUG|SEP|OCT|NOV|DEC)(\d{4})$/ ) { printf ("%s\t%s\t%s\n",$1,$2,$3); exit(0); } else { exit(1); }' "${FNAME}" | read PT1 MON YR
STAT=${?}
if [[ ${STAT} -ne 0 ]]
then
echo "Bad Format: FnameMONYYYY" >&2
fi
done
typeset CMD="cat ${PT1}1${MON}${YR}.txt ${PT1}2${MON}${YR}.txt > \
${PT1}${MON}${YR}"
echo "Cmd = \"${CMD}\""
exit ${STAT}
---------------------------------------

Note: The perl command including the read PT1 MON YR is all one line. The power of this approach is that it actually checks your filename for valid composition (valid monthname, 4 digit year). I've looked this over carefully and it should work. so that all you need to do is ${CMD} to actually exucute the built-up string.

[Amit Agarwal_1]

You can use awk for this.

echo $InputFile | awk '{ printf("%s1%s2", substr($0, 1, 6), substr($0, 7));}'
-Amit

[Sandman!]

The "cat" command can be constructed with the awk excerpt given below:

==============================================================
# export InputFile="SanNonMAR2005"

# echo $Inputfile | awk -F"M" '{system("cat "$1"1M"$2".txt "$1"2M"$2".txt > "$0)}'
==============================================================

This will execute the code you want, i.e.

# cat SanNon1MAR2005.txt SanNon2MAR2005.txt > SanNonMAR2005

cheers!