使用尴尬和循环逐行读取文件

Question

文件包含编译器生成的警告

warnings.txt（带8行）

 Line1  "/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp", line 1657: error #4296-D: arithmetic operation on boolean type
 Line2{ return soap->count - soap->buflen + soap->bufidx - (soap->ahead != 0);
 Line3
 Line4  
 Line5  "/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp", line 4136: warning #3348-D: declaration hides variable "err" (declared at line 3
 Line6 700)
 Line7          { int err = SSL_get_error(soap->ssl, r);
 Line8                ^  

我想使用awk逐行阅读此文件，就像循环需要大量时间来处理

我尝试的两种方法：

for line in `awk '{print $0}' warnings.txt`
do
  echo $line
done

和，

for line in `awk '{BEGIN{ORS="n";}{print $0}' warnings.txt`
do
  echo $line
done

预期输出：

与上面相同（即文件划线的内容）

 Line1  "/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp", line 1657: error #4296-D: arithmetic operation on boolean type
 Line2{ return soap->count - soap->buflen + soap->bufidx - (soap->ahead != 0);
 Line3
 Line4  
 Line5  "/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp", line 4136: warning #3348-D: declaration hides variable "err" (declared at line 3
 Line6 700)
 Line7          { int err = SSL_get_error(soap->ssl, r);
 Line8                ^  

我的输出：

"/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp",
line
1657:
error
#4296-D:
arithmetic
operation
on
boolean
type
{
return
soap->count
-
soap->buflen
+
soap->bufidx
-
(soap->ahead
!=
0);
"/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp",
line
4136:
warning
#3348-D:
declaration
hides
variable
"err"
(declared
at
line
3
700)
{
int
err
=
SSL_get_error(soap->ssl,
r);
^

谢谢

Answer 1

使用read内置

while read -r line; do
    echo "$line"
done < warning.txt

Answer 2

这是您使用awk读取warnings.txt并根据您发布的问题来读取文件的方式：

$ awk '1' warnings.txt
 Line1  "/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp", line 1657: error #4296-D: arithmetic operation on boolean type
 Line2{ return soap->count - soap->buflen + soap->bufidx - (soap->ahead != 0);
 Line3
 Line4
 Line5  "/Project/user/XYZ/gsoap/gsoap-2.8.9/gsoap/stdsoap2.cpp", line 4136: warning #3348-D: declaration hides variable "err" (declared at line 3
 Line6 700)
 Line7          { int err = SSL_get_error(soap->ssl, r);
 Line8                ^

显然，您可以使用cat而不是尴尬来做到这一点。如果您有其他任何内容，请使用该文件的内容，请告诉我们（通过使用预期输出和解释更新您的问题），以便我们可以为您提供帮助。

Answer 3

您可以做到：

代码：

ifsold="$IFS"
IFS="
"
for line in `cat warnings.txt` ; do
    echo "line: $line"
done
IFS="$ifsold"