I’m trying to replace every second instance word of each line with sed
.
For example: If I had a line as below
i_ref_clk i_ref_clk i_ait_rstn i_ait_rstn abc kiran/def
should be replaced as below.
i_ref_clk kiran/i_ref_clk i_ait_rstn kiran/i_ait_rstn abc def kiran/def
Only second instance of word is replaced with kiran/
.
My attempt :
echo " i_ref_clk i_ref_clk i_ait_rstn i_ait_rstn abc def def" | sed 's/ / kiran//2'
Output:
i_ref_clk kiran/i_ref_clk i_ait_rstn i_ait_rstn abc def def
My Question:
Please help me with the proper sed
or any Linux command which does the above job.
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Answer
Could you please try following, if you are ok with awk
.
awk -v var="kiran/" '{for(i=1;i<=NF;i++){if(++a[$i]==2){$i=var $i}};delete a} 1' Input_file
Or adding a non-one liner form of above solution:
awk -v var="kiran/" ' { for(i=1;i<=NF;i++){ if(++a[$i]==2){ $i=var $i } } delete a } 1 ' Input_file
Output for shown sample will be as follows.
i_ref_clk kiran/i_ref_clk i_ait_rstn kiran/i_ait_rstn abc kiran/def