diff --git a/lib/main.js b/lib/main.js
index 33583bf..1659117 100644
--- a/lib/main.js
+++ b/lib/main.js
@@ -20,21 +20,25 @@ function main() {
             {
                 name: name,
                 mode: 0o400,
+                flag: "w",
                 contents: core.getInput("private-key"),
             },
             {
                 name: `${name}.pub`,
                 mode: 0o444,
+                flag: "w",
                 contents: core.getInput("public-key"),
             },
             {
                 name: "known_hosts",
                 mode: 0o644,
+                flag: "a",
                 contents: core.getInput("known-hosts"),
             },
             {
                 name: "config",
                 mode: 0o644,
+                flag: "a",
                 contents: core.getInput("config"),
             },
         ];
@@ -50,6 +54,7 @@ function main() {
             const fileName = path.join(dirName, file.name);
             fs.writeFileSync(fileName, file.contents, {
                 mode: file.mode,
+                flag: file.flag,
             });
         }
         console.log(`SSH key has been stored to ${dirName} successfully.`);
diff --git a/lib/main.js.map b/lib/main.js.map
index 48f897a..b0dda2a 100644
--- a/lib/main.js.map
+++ b/lib/main.js.map
@@ -1 +1 @@
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\ No newline at end of file
+{"version":3,"file":"main.js","sourceRoot":"","sources":["../src/main.ts"],"names":[],"mappings":";;;;;;;;;AAAA,uCAAyB;AACzB,2CAA6B;AAE7B,oDAAsC;AAUtC;;GAEG;AACH,SAAS,IAAI;IAEZ,IACA;QACC,MAAM,IAAI,GAAG,IAAI,CAAC,QAAQ,CAAC,MAAM,CAAC,CAAC;QACnC,MAAM,KAAK,GAAe;YACzB;gBACC,IAAI,EAAE,IAAI;gBACV,IAAI,EAAE,KAAK;gBACX,IAAI,EAAE,GAAG;gBACT,QAAQ,EAAE,IAAI,CAAC,QAAQ,CAAC,aAAa,CAAC;aACtC;YACD;gBACC,IAAI,EAAE,GAAG,IAAI,MAAM;gBACnB,IAAI,EAAE,KAAK;gBACX,IAAI,EAAE,GAAG;gBACT,QAAQ,EAAE,IAAI,CAAC,QAAQ,CAAC,YAAY,CAAC;aACrC;YACD;gBACC,IAAI,EAAE,aAAa;gBACnB,IAAI,EAAE,KAAK;gBACX,IAAI,EAAE,GAAG;gBACT,QAAQ,EAAE,IAAI,CAAC,QAAQ,CAAC,aAAa,CAAC;aACtC;YACD;gBACC,IAAI,EAAE,QAAQ;gBACd,IAAI,EAAE,KAAK;gBACX,IAAI,EAAE,GAAG;gBACT,QAAQ,EAAE,IAAI,CAAC,QAAQ,CAAC,QAAQ,CAAC;aACjC;SACD,CAAC;QAEF,0BAA0B;QAC1B,MAAM,IAAI,GAAG,gBAAgB,EAAE,CAAC;QAChC,MAAM,OAAO,GAAG,IAAI,CAAC,OAAO,CAAC,IAAI,EAAE,MAAM,CAAC,CAAC;QAC3C,EAAE,CAAC,SAAS,CAAC,OAAO,EAAE;YACrB,SAAS,EAAE,IAAI;YACf,IAAI,EAAE,KAAK;SACX,CAAC,CAAC;QAEH,eAAe;QACf,KAAI,MAAM,IAAI,IAAI,KAAK,EACvB;YACC,MAAM,QAAQ,GAAG,IAAI,CAAC,IAAI,CAAC,OAAO,EAAE,IAAI,CAAC,IAAI,CAAC,CAAC;YAC/C,EAAE,CAAC,aAAa,CAAC,QAAQ,EAAE,IAAI,CAAC,QAAQ,EAAE;gBACzC,IAAI,EAAE,IAAI,CAAC,IAAI;gBACf,IAAI,EAAE,IAAI,CAAC,IAAI;aACf,CAAC,CAAC;SACH;QAED,OAAO,CAAC,GAAG,CAAC,8BAA8B,OAAO,gBAAgB,CAAC,CAAC;KACnE;IACD,OAAM,GAAG,EACT;QACC,IAAI,CAAC,SAAS,CAAC,GAAG,CAAC,OAAO,CAAC,CAAC;KAC5B;AACF,CAAC;AAED;;;GAGG;AACH,SAAS,gBAAgB;IAExB,MAAM,OAAO,GAAG,OAAO,CAAC,QAAQ,IAAI,OAAO,CAAC,CAAC,CAAC,aAAa,CAAC,CAAC,CAAC,MAAM,CAAC;IACrE,MAAM,IAAI,GAAG,OAAO,CAAC,GAAG,CAAC,OAAO,CAAC,CAAC;IAClC,IAAG,IAAI,KAAK,SAAS,EACrB;QACC,MAAM,KAAK,CAAC,GAAG,OAAO,iBAAiB,CAAC,CAAC;KACzC;IAED,OAAO,IAAI,CAAC;AACb,CAAC;AAED,IAAI,EAAE,CAAC"}
\ No newline at end of file
diff --git a/src/main.ts b/src/main.ts
index 8ee9b8f..a20632b 100644
--- a/src/main.ts
+++ b/src/main.ts
@@ -7,6 +7,7 @@ interface FileInfo
 {
 	name: string;
 	mode: number;
+	flag: string;
 	contents: string;
 }
 
@@ -22,21 +23,25 @@ function main(): void
 			{
 				name: name,
 				mode: 0o400,
+				flag: "w",
 				contents: core.getInput("private-key"),
 			},
 			{
 				name: `${name}.pub`,
 				mode: 0o444,
+				flag: "w",
 				contents: core.getInput("public-key"),
 			},
 			{
 				name: "known_hosts",
 				mode: 0o644,
+				flag: "a",
 				contents: core.getInput("known-hosts"),
 			},
 			{
 				name: "config",
 				mode: 0o644,
+				flag: "a",
 				contents: core.getInput("config"),
 			},
 		];
@@ -55,6 +60,7 @@ function main(): void
 			const fileName = path.join(dirName, file.name);
 			fs.writeFileSync(fileName, file.contents, {
 				mode: file.mode,
+				flag: file.flag,
 			});
 		}