You want the N
in Var1_X_Var2_Y_Var3_Z_data_N.txt
to be a zero-filled two-digit integer.
Assuming all affected files matches the pattern *_[0-9].txt
:
for name in *_[0-9].txt; do
stem="${name%.txt}" # remove the ".txt" suffix
num=${stem##*_} # extract the number at the end
newname="${stem%[0-9]}$( printf '%02d.txt' "$num" )" # put it back together
printf 'Would rename "%s" into "%s"\n' "$name" "$newname"
# mv -- "$name" "$newname"
done
${name%.txt}
removes the .txt
from the end of $name
, the original filename. This creates the "stem", which is not really the stem since it still has the number at the very end.
${stem##*_}
removes everything up to and including the last underscore in $stem
.
${stem%[0-9]}
is the stem without the number at the end (e.g. Var1_X_Var2_Y_Var3_Z_data_
).
printf '%02d.txt' "$num"
produces a zero-filled two-digit number from $num
, followed by the string .txt
.
Given a directory with the files
Var1_X_Var2_Y_Var3_Z_data_1.txt Var1_X_Var2_Y_Var3_Z_data_23.txt
Var1_X_Var2_Y_Var3_Z_data_10.txt Var1_X_Var2_Y_Var3_Z_data_24.txt
Var1_X_Var2_Y_Var3_Z_data_11.txt Var1_X_Var2_Y_Var3_Z_data_25.txt
Var1_X_Var2_Y_Var3_Z_data_12.txt Var1_X_Var2_Y_Var3_Z_data_26.txt
Var1_X_Var2_Y_Var3_Z_data_13.txt Var1_X_Var2_Y_Var3_Z_data_27.txt
Var1_X_Var2_Y_Var3_Z_data_14.txt Var1_X_Var2_Y_Var3_Z_data_28.txt
Var1_X_Var2_Y_Var3_Z_data_15.txt Var1_X_Var2_Y_Var3_Z_data_29.txt
Var1_X_Var2_Y_Var3_Z_data_16.txt Var1_X_Var2_Y_Var3_Z_data_3.txt
Var1_X_Var2_Y_Var3_Z_data_17.txt Var1_X_Var2_Y_Var3_Z_data_30.txt
Var1_X_Var2_Y_Var3_Z_data_18.txt Var1_X_Var2_Y_Var3_Z_data_4.txt
Var1_X_Var2_Y_Var3_Z_data_19.txt Var1_X_Var2_Y_Var3_Z_data_5.txt
Var1_X_Var2_Y_Var3_Z_data_2.txt Var1_X_Var2_Y_Var3_Z_data_6.txt
Var1_X_Var2_Y_Var3_Z_data_20.txt Var1_X_Var2_Y_Var3_Z_data_7.txt
Var1_X_Var2_Y_Var3_Z_data_21.txt Var1_X_Var2_Y_Var3_Z_data_8.txt
Var1_X_Var2_Y_Var3_Z_data_22.txt Var1_X_Var2_Y_Var3_Z_data_9.txt
.. that loop would produce
Would rename "Var1_X_Var2_Y_Var3_Z_data_1.txt" into "Var1_X_Var2_Y_Var3_Z_data_01.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_2.txt" into "Var1_X_Var2_Y_Var3_Z_data_02.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_3.txt" into "Var1_X_Var2_Y_Var3_Z_data_03.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_4.txt" into "Var1_X_Var2_Y_Var3_Z_data_04.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_5.txt" into "Var1_X_Var2_Y_Var3_Z_data_05.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_6.txt" into "Var1_X_Var2_Y_Var3_Z_data_06.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_7.txt" into "Var1_X_Var2_Y_Var3_Z_data_07.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_8.txt" into "Var1_X_Var2_Y_Var3_Z_data_08.txt"
Would rename "Var1_X_Var2_Y_Var3_Z_data_9.txt" into "Var1_X_Var2_Y_Var3_Z_data_09.txt"
Remove the commented out mv
at the end of the loop to actually rename the files.