Hi. I am trying to write a shell script to run a program with dynamically changing command line arguments. Here is what I've got so far: #!/bin/bash count=0 steps=100 starts=10 filename="file2.txt" for j in `seq 100 400 100` do for i in `seq 1 11 2` do starts=${i} steps=${j} ./Prog s${steps} r${starts} c${count} f${filename} > results.txt count=${count}+1 done done hopefully from that it is clear what I am trying to do but to summarise, I want to do a for loop and a nested for loop and pass the loop indices as command lne parameters for the program. Also, with every execution of the program I want to increment the count command line parameter. I know practically nothing about bash scripting and do not really have the time to learn it so I would really apreciate any suggestions on how to do this. Thanks.

i think you got the seq command wrong.. seq [OPTION]... FIRST INCREMENT LAST ------------------ #!/bin/bash #### VARIABLES #### # createing integer variables (( count = 0 )) (( steps = 100 )) (( starts = 10 )) filename="file2.txt" #### MAIN #### for j in `seq 100 100 400` do for i in `seq 1 2 11` do starts=${i} steps=${j} ./Prog s${steps} r${starts} c${count} f${filename} > results.txt (( count += 1 )) done done ------------------ this will run: ./Prog s100 r1 c0 ffile2.txt > results.txt ./Prog s100 r3 c1 ffile2.txt > results.txt ./Prog s100 r5 c2 ffile2.txt > results.txt ./Prog s100 r7 c3 ffile2.txt > results.txt ./Prog s100 r9 c4 ffile2.txt > results.txt ./Prog s100 r11 c5 ffile2.txt > results.txt ./Prog s200 r1 c6 ffile2.txt > results.txt ./Prog s200 r3 c7 ffile2.txt > results.txt ./Prog s200 r5 c8 ffile2.txt > results.txt ./Prog s200 r7 c9 ffile2.txt > results.txt ./Prog s200 r9 c10 ffile2.txt > results.txt ./Prog s200 r11 c11 ffile2.txt > results.txt ./Prog s300 r1 c12 ffile2.txt > results.txt ./Prog s300 r3 c13 ffile2.txt > results.txt ./Prog s300 r5 c14 ffile2.txt > results.txt ./Prog s300 r7 c15 ffile2.txt > results.txt ./Prog s300 r9 c16 ffile2.txt > results.txt ./Prog s300 r11 c17 ffile2.txt > results.txt ./Prog s400 r1 c18 ffile2.txt > results.txt ./Prog s400 r3 c19 ffile2.txt > results.txt ./Prog s400 r5 c20 ffile2.txt > results.txt ./Prog s400 r7 c21 ffile2.txt > results.txt ./Prog s400 r9 c22 ffile2.txt > results.txt ./Prog s400 r11 c23 ffile2.txt > results.txt Greetz, Shadowlight.