Script gives error when scheduled in crontab

UNIX for Beginners Q & A
1

i have written one script which is working fine when i run it manually but giving error when i schedule it in crontab.
cat SUMMARY.sh

 
 #!/bin/bash
 DT1=`date +%Y%m%d`
echo "Off      PP          TT" >>summary_$DT1.txt
 
cat ues1.txt_$DT1 >>summary_$DT1.txt
cat ues2.txt_$DT1 >>summary_$DT1.txt
cat ues3.txt_$DT1 >>summary_$DT1.txt
cat ues4.txt_$DT1 >>summary_$DT1.txt
cat ues5.txt_$DT1 >>summary_$DT1.txt
cat ues6.txt_$DT1 >>summary_$DT1.txt

error getting while running from crontab

 
 cat: ues1.txt_20170530: No such file or directory
cat: ues2.txt_20170530: No such file or directory
cat: ues3.txt_20170530: No such file or directory
cat: ues4.txt_20170530: No such file or directory
cat: ues5.txt_20170530: No such file or directory
cat: ues6.txt_20170530: No such file or directory
2

There is no path to your file, cron is the most dumb program you will find.. it has a very minimalist environment so all has to be given...

3

You need to cd to where the files are.
Also cat means concatenation, so you can do the same in one stroke

#!/bin/bash
if cd /path/to/the/files
then
  DT1=`date +%Y%m%d`
  echo "Off      PP          TT" >>summary_$DT1.txt
  cat ues{1,2,3,4,5,6}.txt_$DT1 >>summary_$DT1.txt
fi