我正在尝试编写一个脚本，在“ GOOD”一词后添加单引号。 例如，我有file1：
//WER GOOD=ONE
//WER1 GOOD=TWO2
//PR1 GOOD=THR45
...
所需的更改是添加单引号：
//WER GOOD='ONE'
//WER1 GOOD='TWO2'
//PR1 GOOD='THR45'
...
这是我要运行的脚本：
#!/bin/bash
for item in `grep "GOOD" file1 | cut -f2 -d '='`
do
sed -i 's/$item/`\$item/`\/g' file1
done
谢谢您的帮助！
请您尝试以下。
sed "s/\(.*=\)\(.*\)/\1'\2'/" Input_file
或根据OP的注释删除空行使用：
sed "s/\(.*=\)\(.*\)/\1'\2'/;/^$/d" Input_file
说明： 以下内容仅出于解释目的。
sed " ##Starting sed command from here.
s/ ##Using s to start substitution process from here.
\(.*=\)\(.*\) ##Using sed buffer capability to store matched regex into memory,saving everything till = in 1st buffer and rest of line in 2nd memory buffer.
/\1'\2' ##Now substituting 1st and 2nd memory buffers with \1'\2' as per OP need adding single quotes before = here.
/" Input_file ##Closing block for substitution,mentioning Input_file name here.
如果要将输出保存到Input_file本身，请在上面的代码中使用-i选项。
使用awk的第二个解决方案：
awk 'match($0,/=.*/){$0=substr($0,1,RSTART) "\047" substr($0,RSTART+1,RLENGTH) "\047"} 1' Input_file
说明： 添加上述代码的说明。
awk '
match($0,/=.*/){ ##Using match function to mmatch everything from = to till end of line.
$0=substr($0,RLENGTH) "\047" ##Creating value of $0 with sub-strings till value of RSTART and adding ' then sub-strings till end of line adding ' then as per OP need.
} ##Where RSTART and RLENGTH are variables which will be SET once a TRUE matched regex is found.
1 ##1 will print edited/non-edited line.
' Input_file ##Mentioning Input_file name here.
第三种解决方案： ：如果Input_file中只有2个字段，请尝试在awk中更简单：
awk 'BEGIN{FS=OFS="="} {$2="\047" $2 "\047"} 1' Input_file
第三个代码的解释： 仅用于说明目的，为了运行，请使用上面的代码本身。
awk ' ##Starting awk program here.
BEGIN{FS=OFS="="} ##Setting FS and OFS values as = for all line for Input_file here.
{$2="\047" $2 "\047"} ##Setting $2 value with adding a ' $2 and then ' as per OP need.
1 ##Mentioning 1 will print edited/non-edited lines here.
' Input_file ##Mentioning Input_file name here.