I have a data file with following lines: 

gtssmpar11/dmunit1/mt_dm_fifo_csr_flopped_out/u_gt_ram/wrdataR_reg_0_b
+171_b174_b236_b242_qreg/d2    19.33    18.65    -0.67 (VIOLATED)
gtssmpar11/dmunit1/mt_dm_fifo_csr_flopped_out/u_gt_ram/wrdataR_reg_0_b
+186_b196_b210_b223_qreg/d2    15.09    11.70    -3.39 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b103_b104/d2    40.35    36.61    -3.74 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b105_b106/d1    11.06     8.77    -2.29 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b105_b106/d1    40.08    29.18   -10.90 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b119_b120/d2    11.37     8.34    -3.03 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b11_b12/d2    14.56     4.41   -10.15 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b11_b12/d2    45.82    27.47   -18.34 (VIOLATED)

[download]

And I need to get the unique value and the smallest one for the fourth column with corresponding 1st column.

Output should be: 

gtssmpar11/dmunit1/mt_dm_fifo_csr_flopped_out/u_gt_ram/wrdataR_reg_0_b
+171_b174_b236_b242_qreg/d2    19.33    18.65    -0.67 (VIOLATED)
gtssmpar11/dmunit1/mt_dm_fifo_csr_flopped_out/u_gt_ram/wrdataR_reg_0_b
+186_b196_b210_b223_qreg/d2    15.09    11.70    -3.39 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b103_b104/d2    40.35    36.61    -3.74 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b105_b106/d1    40.08    29.18   -10.90 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b119_b120/d2    11.37     8.34    -3.03 (VIOLATED)
gtssmpar21/flunit1/flunitx1/fl_flex1/fl_mt_input_fifo/u_gt_ram/wrdataR
+_dreg_b11_b12/d2    45.82

[download]

I tried using pattern matching to get the column 1 and column 4 in hash and then sort the hash. But its not working the way i want. Please help.

In reply to Sorting unique values in file using perl by PerlSavvy

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