UNIX for Beginners Questions & Answers

ABC_AAA_DETL.tmp
ABC_BBB_DETL.tmp
ABC_CCC_DETL.tmp
PQR_DETL.tmp
DEF_DETL.tmp
JKL_DETL.tmp
YUI_DETL.tmp
TG_NM_DDD_DETL.tmp
TG_NM_EEE_DETL.tmp
GHJ_DETL.tmp
RTY_DETL.tmp

ABC_AAA
ABC_BBB
ABC_CCC
PQR
DEF
JKL
YUI
TG_NM_DDD
TG_NM_EEE
GHJ
RTY

 awk -F"_DETL" '{print $1}'   Input_file

for file in *.tmp; do echo $file | awk -F"_DETL" '{print $1}'; done
OR
for file in *.tmp
do
     echo $file | awk -F"_DETL" '{print $1}'
done

for FN in *.tmp; do echo ${FN%%_DETL*}; done

for FN in *_DETL.tmp; do echo "${FN%_*}"; done