Append all files in a folder

Shell Programming and Scripting
1

Hi All,

I have directory in which I have around 50 files with filename as:

abcs_1
afaa_2
asda_3
agfa_4
.
.
sada_50

I want to append all files in sada_50 i.e first ssdd_49 in sada_50. Then
append asda_48 in (ssdd_49 in sada_50).

As number of files are more I do not feel like going for "cat 48 49 > 50" and I want to write a generic script in which I mention the max file number (here 50) and I get all files in single.

I have tried to write but not I am new to shell and not able to find exact soln.

$ appendfiles.bash 50

maxcount=$1
count=maxcount
MY_DIR=/home/my/dir/

maxfile= 'ls -l' | grep $maxcount

echo $maxfile

while test $count -le 1
do
echo $count
count=`expr $count - 1`
echo $count

nextminfile= 'ls -l' | grep $count
cat MY_DIR/newDir/$nextminfile > MY_DIR/newDir/$maxfile
done

Please help.
Thanks !!

2

Hi,

This should get you going. You can compare the differences and take it from there:

maxcount=$1
count=$maxcount
MY_DIR=/home/my/dir/
if [ ! -d $MY_DIR/newDir ]; then
  mkdir -p  $MY_DIR/newDir
fi
cd $MY_DIR/newDir
# maxfile= 'ls -l' | grep $maxcount
maxfile=*_$maxcount
echo $maxfile
until test $count -le 1
do
  echo $count
  count=`expr $count - 1`
  echo $count
  # nextminfile= 'ls -l' | grep $count
  nextminfile=*_$count
  echo $nextminfile
  cat $nextminfile >> $maxfile
done
3

Variable assignments do not undergo filename expansion. Those asterisks will be taken literally.

Regards,
Alister

---------- Post updated at 03:08 PM ---------- Previous update was at 03:07 PM ----------

A possible alternative or starting point:

#!/bin/sh

i=0 max=$1
while [ $((++i)) -lt $max ]; do
    cat *_$i
done > "$(echo *_$max)" 2>/dev/null

Regards,
Alister

4

They do not need to. The expansion is done in this statement:

cat $nextminfile >> $maxfile
5

How much more? (How big?) - At least for me, the following worked, read: processed several hundred small plain text files without any problem (on a workstation, though):

cat $( ls *.txt ) > collection
6

This should work if i have understood your question properly

for i in `ls /path/to/dir`
do
`echo $i >> out.txt`
done
7

Hi

awk 'FNR==1{split(FILENAME,a,"_"); if (a[2]<m) y=system("cat " FILENAME);}' m=50 * > sada_50

Guru.

8

Indeed. Pardon the noise :wink:

Cheers,
Alister