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...equivalent function from "trim" or "rtrim" or...

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Question by pierric
Submitted on 7/20/2003
Related FAQ: comp.lang.awk FAQ
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Is there any equivalent function from "trim" or "rtrim" or ltrim" ?


Answer by rockmelon
Submitted on 9/8/2003
Rating:  Rate this answer: Vote
gsub is your friend:

ltrim(v) = gsub(/^[ \t]+/, "", v)
rtrim(v) = gsub(/[ \t]+$/, "", v)
trim(v)  = ltrim(v); rtrim(v)

 

Answer by khom
Submitted on 7/26/2005
Rating: Not yet rated Rate this answer: Vote
# EXAMPLE:
# echo "    ltrim    ,    rtrim    ,    trim    " | awk -F',' -f trim.awk
function ltrim(v)
{
   gsub(/^[ \t]+/, "", v);
   return v;
}
function rtrim(v)
{
   gsub(/[ \t]+$/, "", v);
   return v;
}
function trim(v)
{
   return ltrim(rtrim(v));
}
{
   print "[" ltrim($1) "] [" rtrim($2) "] [" trim($3) "]"
}

 

Answer by hansmuff
Submitted on 8/23/2005
Rating: Not yet rated Rate this answer: Vote
gsub works perfectly fine. The following may be faster, depending on the awk interpreter:

function trim (string, what,   ret) {
   ret = rtrim(string, what)
   ret = ltrim(ret, what)
   return ret
}   
function rtrim (string, what,   ret) {
   ret = string
   while (substr(ret, 1, 1) ~"[" what "]")
      ret = substr(ret, 2)
   return ret
}
function ltrim (string, what,   ret) {
   ret = string
   while (substr(ret, length(ret), 1) ~"[" what "]")
      ret = substr(ret, 1, length(ret) - 1)
   return ret
}

 

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